From 649828b3c37c0b4b23f61857c6c0398e7ee590e8 Mon Sep 17 00:00:00 2001
From: Patrick Noland <pnoland@google.com>
Date: Thu, 04 Sep 2025 13:57:15 -0700
Subject: [PATCH] Reset active gesture count on tab change or crash

The active gesture count suppresses captures until the gesture ends.
This value can become invalid if we don't receive a balanced number of
acks for gesture begins and ends. Two ways that can happen are changing
tabs between acks or crashes; regardless, it's safe to reset the value
in both these cases.

Bug: 442636157, 434751393
Change-Id: Idb6be4ed8b53bdc2e2f594db01813c2e13c52801
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6917456
Reviewed-by: Sky Malice <skym@chromium.org>
Commit-Queue: Patrick Noland <pnoland@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1511136}
---

diff --git a/chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorViewHolder.java b/chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorViewHolder.java
index 551d47c..aef02b8 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorViewHolder.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorViewHolder.java
@@ -318,6 +318,11 @@
                 }
 
                 @Override
+                public void onCrash(Tab tab) {
+                    mNumGestureActiveTouches = 0;
+                }
+
+                @Override
                 public void onDidFinishNavigationInPrimaryMainFrame(
                         Tab tab, NavigationHandle navigation) {
                     if (!navigation.isSameDocument() && navigation.hasCommitted()) {
@@ -337,7 +342,7 @@
 
                 @Override
                 public void onGestureEnd() {
-                    mNumGestureActiveTouches--;
+                    mNumGestureActiveTouches = Math.max(mNumGestureActiveTouches - 1, 0);
                     updateInMotion();
                 }
             };
@@ -1541,6 +1546,7 @@
             mHasKeyboardGeometryChangeFired = false;
             if (mTabVisible != null) mTabVisible.removeObserver(mTabObserver);
             if (tab != null) {
+                mNumGestureActiveTouches = 0;
                 tab.addObserver(mTabObserver);
                 mCompositorView.onTabChanged();
             }