From e81ab324244b7c87c500cc0dc022c40089f86bee Mon Sep 17 00:00:00 2001
From: Patrick Noland <pnoland@google.com>
Date: Fri, 24 Oct 2025 09:00:23 -0700
Subject: [PATCH] Push browser controls update whenever bottom controls height changes

The old logic failed to push updates when height changed at 0% shown
ratio. This was a problem because the offset needs to change when the
height changes at 0% to reflect the new height (i.e. the offset should
become the new height) to avoid leaving the controls partially visible.
The new logic matches existing logic for top controls.

Bug: 454354281
Change-Id: I733d103e8cda58a4dbeefe1fa71282924f7bcd27
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7081525
Commit-Queue: Patrick Noland <pnoland@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1535059}
---

diff --git a/content/browser/renderer_host/render_widget_host_view_android.cc b/content/browser/renderer_host/render_widget_host_view_android.cc
index 5b904f6..f91c4c48 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.cc
+++ b/content/browser/renderer_host/render_widget_host_view_android.cc
@@ -668,6 +668,7 @@
       prev_top_controls_translate_(0.f),
       prev_top_controls_min_height_offset_pix_(0.f),
       prev_bottom_shown_pix_(0.f),
+      prev_bottom_controls_pix_(0.f),
       prev_bottom_controls_translate_(0.f),
       prev_bottom_controls_min_height_offset_pix_(0.f),
       page_scale_(1.f),
@@ -2253,6 +2254,8 @@
   float bottom_shown_pix = bottom_controls_pix * bottom_controls_shown_ratio;
   bool bottom_changed = !cc::MathUtil::IsFloatNearlyTheSame(
       bottom_shown_pix, prev_bottom_shown_pix_);
+  bottom_changed |= !cc::MathUtil::IsFloatNearlyTheSame(
+      bottom_controls_pix, prev_bottom_controls_pix_);
   float bottom_translate = bottom_controls_pix - bottom_shown_pix;
 
   float bottom_min_height_offset_pix = bottom_controls_min_height_offset;
@@ -2268,6 +2271,7 @@
   prev_bottom_shown_pix_ = bottom_shown_pix;
   prev_bottom_controls_translate_ = bottom_translate;
   prev_bottom_controls_min_height_offset_pix_ = bottom_min_height_offset_pix;
+  prev_bottom_controls_pix_ = bottom_controls_pix;
   controls_initialized_ = true;
   return top_changed || bottom_changed;
 }
diff --git a/content/browser/renderer_host/render_widget_host_view_android.h b/content/browser/renderer_host/render_widget_host_view_android.h
index baa9346..7e1cbb1 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.h
+++ b/content/browser/renderer_host/render_widget_host_view_android.h
@@ -539,6 +539,7 @@
   FRIEND_TEST_ALL_PREFIXES(SitePerProcessBrowserTest,
                            GestureManagerListensToChildFrames);
   FRIEND_TEST_ALL_PREFIXES(RenderWidgetHostViewAndroidTest, DisplayFeature);
+  FRIEND_TEST_ALL_PREFIXES(RenderWidgetHostViewAndroidTest, UpdateControls);
   FRIEND_TEST_ALL_PREFIXES(RenderWidgetHostViewAndroidFluidResizeBrowserTest,
                            ResizeDefersSynchronizationToNextFrame);
 
@@ -763,6 +764,7 @@
   float prev_top_controls_translate_;
   float prev_top_controls_min_height_offset_pix_;
   float prev_bottom_shown_pix_;
+  float prev_bottom_controls_pix_;
   float prev_bottom_controls_translate_;
   float prev_bottom_controls_min_height_offset_pix_;
   float page_scale_;
diff --git a/content/browser/renderer_host/render_widget_host_view_android_unittest.cc b/content/browser/renderer_host/render_widget_host_view_android_unittest.cc
index 4a243d7..f53031d 100644
--- a/content/browser/renderer_host/render_widget_host_view_android_unittest.cc
+++ b/content/browser/renderer_host/render_widget_host_view_android_unittest.cc
@@ -667,6 +667,85 @@
   base::RunLoop().RunUntilIdle();
 }
 
+TEST_F(RenderWidgetHostViewAndroidTest, UpdateControls) {
+  float dip_scale = 1.0f;
+  float top_height = 90.f;
+  float top_ratio = 1.f;
+  float top_min_height = 0.f;
+  float bottom_height = 50.f;
+  float bottom_ratio = 1.f;
+  float bottom_min_height = 0.f;
+
+  // Get the test view instance from the fixture.
+  RenderWidgetHostViewAndroid* rwhva = render_widget_host_view_android();
+
+  // 1. First call should return true as controls are uninitialized.
+  EXPECT_TRUE(rwhva->UpdateControls(dip_scale, top_height, top_ratio,
+                                    top_min_height, bottom_height, bottom_ratio,
+                                    bottom_min_height));
+
+  EXPECT_FALSE(rwhva->UpdateControls(dip_scale, top_height, top_ratio,
+                                     top_min_height, bottom_height,
+                                     bottom_ratio, bottom_min_height));
+
+  // 3. Change top_controls_height.
+  float new_top_height = 100.f;
+  EXPECT_TRUE(rwhva->UpdateControls(dip_scale, new_top_height, top_ratio,
+                                    top_min_height, bottom_height, bottom_ratio,
+                                    bottom_min_height));
+  // Call again with same values, should return false.
+  EXPECT_FALSE(rwhva->UpdateControls(dip_scale, new_top_height, top_ratio,
+                                     top_min_height, bottom_height,
+                                     bottom_ratio, bottom_min_height));
+
+  // 4. Change top_controls_shown_ratio.
+  float new_top_ratio = 0.5f;
+  EXPECT_TRUE(rwhva->UpdateControls(dip_scale, new_top_height, new_top_ratio,
+                                    top_min_height, bottom_height, bottom_ratio,
+                                    bottom_min_height));
+  EXPECT_FALSE(rwhva->UpdateControls(dip_scale, new_top_height, new_top_ratio,
+                                     top_min_height, bottom_height,
+                                     bottom_ratio, bottom_min_height));
+
+  // 5. Change top_controls_min_height_offset.
+  float new_top_min_height = 10.f;
+  EXPECT_TRUE(rwhva->UpdateControls(dip_scale, new_top_height, new_top_ratio,
+                                    new_top_min_height, bottom_height,
+                                    bottom_ratio, bottom_min_height));
+  // Call again with same values, should return false.
+  EXPECT_FALSE(rwhva->UpdateControls(dip_scale, new_top_height, new_top_ratio,
+                                     new_top_min_height, bottom_height,
+                                     bottom_ratio, bottom_min_height));
+
+  // 6. Change bottom_controls_shown_ratio.
+  float new_bottom_ratio = 0.0f;
+  EXPECT_TRUE(rwhva->UpdateControls(dip_scale, new_top_height, new_top_ratio,
+                                    new_top_min_height, bottom_height,
+                                    new_bottom_ratio, bottom_min_height));
+
+  EXPECT_FALSE(rwhva->UpdateControls(dip_scale, new_top_height, new_top_ratio,
+                                     new_top_min_height, bottom_height,
+                                     new_bottom_ratio, bottom_min_height));
+
+  // 7. Change bottom_controls_height while at 0% shown ratio.
+  float new_bottom_height = 60.f;
+  EXPECT_TRUE(rwhva->UpdateControls(dip_scale, new_top_height, new_top_ratio,
+                                    new_top_min_height, new_bottom_height,
+                                    new_bottom_ratio, bottom_min_height));
+  EXPECT_FALSE(rwhva->UpdateControls(dip_scale, new_top_height, new_top_ratio,
+                                     new_top_min_height, new_bottom_height,
+                                     new_bottom_ratio, bottom_min_height));
+
+  // 8. Change bottom_controls_min_height_offset.
+  float new_bottom_min_height = 10.f;
+  EXPECT_TRUE(rwhva->UpdateControls(dip_scale, new_top_height, new_top_ratio,
+                                    new_top_min_height, new_bottom_height,
+                                    new_bottom_ratio, new_bottom_min_height));
+  EXPECT_FALSE(rwhva->UpdateControls(dip_scale, new_top_height, new_top_ratio,
+                                     new_top_min_height, new_bottom_height,
+                                     new_bottom_ratio, new_bottom_min_height));
+}
+
 // Test for scaling.
 class RenderWidgetHostViewAndroidScalingTest
     : public RenderWidgetHostViewAndroidTest {

diff --git a/content/browser/renderer_host/render_widget_host_view_android_unittest.cc b/content/browser/renderer_host/render_widget_host_view_android_unittest.cc
index 4a243d7..f53031d 100644
--- a/content/browser/renderer_host/render_widget_host_view_android_unittest.cc
+++ b/content/browser/renderer_host/render_widget_host_view_android_unittest.cc
@@ -667,6 +667,85 @@
   base::RunLoop().RunUntilIdle();
 }
 
+TEST_F(RenderWidgetHostViewAndroidTest, UpdateControls) {
+  float dip_scale = 1.0f;
+  float top_height = 90.f;
+  float top_ratio = 1.f;
+  float top_min_height = 0.f;
+  float bottom_height = 50.f;
+  float bottom_ratio = 1.f;
+  float bottom_min_height = 0.f;
+
+  // Get the test view instance from the fixture.
+  RenderWidgetHostViewAndroid* rwhva = render_widget_host_view_android();
+
+  // 1. First call should return true as controls are uninitialized.
+  EXPECT_TRUE(rwhva->UpdateControls(dip_scale, top_height, top_ratio,
+                                    top_min_height, bottom_height, bottom_ratio,
+                                    bottom_min_height));
+
+  EXPECT_FALSE(rwhva->UpdateControls(dip_scale, top_height, top_ratio,
+                                     top_min_height, bottom_height,
+                                     bottom_ratio, bottom_min_height));
+
+  // 3. Change top_controls_height.
+  float new_top_height = 100.f;
+  EXPECT_TRUE(rwhva->UpdateControls(dip_scale, new_top_height, top_ratio,
+                                    top_min_height, bottom_height, bottom_ratio,
+                                    bottom_min_height));
+  // Call again with same values, should return false.
+  EXPECT_FALSE(rwhva->UpdateControls(dip_scale, new_top_height, top_ratio,
+                                     top_min_height, bottom_height,
+                                     bottom_ratio, bottom_min_height));
+
+  // 4. Change top_controls_shown_ratio.
+  float new_top_ratio = 0.5f;
+  EXPECT_TRUE(rwhva->UpdateControls(dip_scale, new_top_height, new_top_ratio,
+                                    top_min_height, bottom_height, bottom_ratio,
+                                    bottom_min_height));
+  EXPECT_FALSE(rwhva->UpdateControls(dip_scale, new_top_height, new_top_ratio,
+                                     top_min_height, bottom_height,
+                                     bottom_ratio, bottom_min_height));
+
+  // 5. Change top_controls_min_height_offset.
+  float new_top_min_height = 10.f;
+  EXPECT_TRUE(rwhva->UpdateControls(dip_scale, new_top_height, new_top_ratio,
+                                    new_top_min_height, bottom_height,
+                                    bottom_ratio, bottom_min_height));
+  // Call again with same values, should return false.
+  EXPECT_FALSE(rwhva->UpdateControls(dip_scale, new_top_height, new_top_ratio,
+                                     new_top_min_height, bottom_height,
+                                     bottom_ratio, bottom_min_height));
+
+  // 6. Change bottom_controls_shown_ratio.
+  float new_bottom_ratio = 0.0f;
+  EXPECT_TRUE(rwhva->UpdateControls(dip_scale, new_top_height, new_top_ratio,
+                                    new_top_min_height, bottom_height,
+                                    new_bottom_ratio, bottom_min_height));
+
+  EXPECT_FALSE(rwhva->UpdateControls(dip_scale, new_top_height, new_top_ratio,
+                                     new_top_min_height, bottom_height,
+                                     new_bottom_ratio, bottom_min_height));
+
+  // 7. Change bottom_controls_height while at 0% shown ratio.
+  float new_bottom_height = 60.f;
+  EXPECT_TRUE(rwhva->UpdateControls(dip_scale, new_top_height, new_top_ratio,
+                                    new_top_min_height, new_bottom_height,
+                                    new_bottom_ratio, bottom_min_height));
+  EXPECT_FALSE(rwhva->UpdateControls(dip_scale, new_top_height, new_top_ratio,
+                                     new_top_min_height, new_bottom_height,
+                                     new_bottom_ratio, bottom_min_height));
+
+  // 8. Change bottom_controls_min_height_offset.
+  float new_bottom_min_height = 10.f;
+  EXPECT_TRUE(rwhva->UpdateControls(dip_scale, new_top_height, new_top_ratio,
+                                    new_top_min_height, new_bottom_height,
+                                    new_bottom_ratio, new_bottom_min_height));
+  EXPECT_FALSE(rwhva->UpdateControls(dip_scale, new_top_height, new_top_ratio,
+                                     new_top_min_height, new_bottom_height,
+                                     new_bottom_ratio, new_bottom_min_height));
+}
+
 // Test for scaling.
 class RenderWidgetHostViewAndroidScalingTest
     : public RenderWidgetHostViewAndroidTest {