[Android] Disable fling cancel filtering in the GestureEventQueue

content/browser/renderer_host/input/input_router_config_helper.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/input/input_router_config_helper.h"
 
 #include "base/command_line.h"
 #include "content/public/common/content_switches.h"
 #include "ui/events/gesture_detection/gesture_detector.h"
 
@@ skipping 52 matching lines @@
   GestureEventQueue::Config config;
 
   config.touchscreen_tap_suppression_config.enabled = true;
   config.touchscreen_tap_suppression_config.max_cancel_to_down_time =
       base::TimeDelta::FromMilliseconds(
           gfx::ViewConfiguration::GetTapTimeoutInMs());
   config.touchscreen_tap_suppression_config.max_tap_gap_time =
       base::TimeDelta::FromMilliseconds(
           gfx::ViewConfiguration::GetLongPressTimeoutInMs());
 
+  // Android WebView may handle root layer flings itself, which prevents
+  // accurate fling cancel filtering (see |RenderWidgetCompositor::Initialize|).
+  // TODO(jdduke): Remove this exception when the WebView fling architecture
+  // is unified with the rest of Chrome, crbug.com/378984.
+  config.enable_fling_cancel_filtering = false;
+
   return config;
 }
 
 TouchEventQueue::Config GetTouchEventQueueConfig() {
   TouchEventQueue::Config config;
 
   config.touch_ack_timeout_delay =
       base::TimeDelta::FromMilliseconds(kTouchAckTimeoutDelayMs);
   config.touch_ack_timeout_supported = true;
 
@@ skipping 15 matching lines @@
 }  // namespace
 
 InputRouterImpl::Config GetInputRouterConfigForPlatform() {
   InputRouterImpl::Config config;
   config.gesture_config = GetGestureEventQueueConfig();
   config.touch_config = GetTouchEventQueueConfig();
   return config;
 }
 
 }  // namespace content