[Android] Disable fling cancel filtering in the GestureEventQueue

content/browser/renderer_host/input/gesture_event_queue.h

Index: content/browser/renderer_host/input/gesture_event_queue.h
diff --git a/content/browser/renderer_host/input/gesture_event_queue.h b/content/browser/renderer_host/input/gesture_event_queue.h
index 693d25d6aa02311d89703ad8fe83acf7efa6f07b..304366802504d99ffc27b6658eada5df6f271322 100644
--- a/content/browser/renderer_host/input/gesture_event_queue.h
+++ b/content/browser/renderer_host/input/gesture_event_queue.h
@@ -73,6 +73,12 @@ class CONTENT_EXPORT GestureEventQueue {
     // active scroll sequence, suppressing brief scroll interruptions.
     // Zero by default (disabled).
     base::TimeDelta debounce_interval;
+
+    // Whether to filter unnecessary GestureFlingCancel events. Filtering should
+    // be disabled if there may be content-targetting fling curves about which
+    // the renderer is unaware (e.g., with Android WebView).
+    // True by default.
+    bool enable_fling_cancel_filtering;
   };
 
   // Both |client| and |touchpad_client| must outlive the GestureEventQueue.
@@ -159,6 +165,9 @@ class CONTENT_EXPORT GestureEventQueue {
   // The receiver of all forwarded gesture events.
   GestureEventQueueClient* client_;
 
+  // Whether to filter unnecessary GestureFlingCancel events.
+  bool enable_fling_cancel_filtering_;
+
   // Whether there are any active flings in the renderer. As the fling
   // end notification is asynchronous, we use a count rather than a boolean
   // to avoid races in bookkeeping when starting a new fling.