[Android] Always insert a TouchCancel if window or tab focus is lost

content/browser/android/content_view_core_impl.h

Index: content/browser/android/content_view_core_impl.h
diff --git a/content/browser/android/content_view_core_impl.h b/content/browser/android/content_view_core_impl.h
index bcf6694d87586aac336b650e8184bb47228b75dc..9c4ec19aca32304737bcbf560959f9fd6623170d 100644
--- a/content/browser/android/content_view_core_impl.h
+++ b/content/browser/android/content_view_core_impl.h
@@ -345,6 +345,10 @@ class ContentViewCoreImpl : public ContentViewCore,
   // Send device_orientation_ to renderer.
   void SendOrientationChangeEventInternal();
 
+  // Utility method for synthesizing a touch cancel event and dispatching it
+  // through the touch pipeline.
+  void CancelActiveTouchSequenceIfNecessary();
+
   // A weak reference to the Java ContentViewCore object.
   JavaObjectWeakGlobalRef java_ref_;