Make touch-based synthetic gesture take touch slop into account.

content/browser/renderer_host/input/synthetic_gesture_target_aura.cc

 // Copyright 2013 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/synthetic_gesture_target_aura.h"
 
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_view_aura.h"
 #include "content/browser/renderer_host/ui_events_helper.h"
 #include "content/common/input/input_event.h"
 #include "ui/aura/client/screen_position_client.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
+#include "ui/events/gestures/gesture_configuration.h"
 
 using blink::WebTouchEvent;
 using blink::WebMouseWheelEvent;
 
 namespace content {
 
 SyntheticGestureTargetAura::SyntheticGestureTargetAura(
     RenderWidgetHostImpl* host)
     : SyntheticGestureTargetBase(host) {
 }
@@ skipping 39 matching lines @@
   // DispatchWebMouseWheelEventToPlatform is ready.
   return SyntheticGestureParams::TOUCH_INPUT;
 }
 
 bool SyntheticGestureTargetAura::SupportsSyntheticGestureSourceType(
     SyntheticGestureParams::GestureSourceType gesture_source_type) const {
   return gesture_source_type == SyntheticGestureParams::TOUCH_INPUT ||
       gesture_source_type == SyntheticGestureParams::MOUSE_INPUT;
 }
 
+int SyntheticGestureTargetAura::GetTouchSlopInDips() const {
+  // - 1 because Aura considers a pointer to be moving if it has moved at least
+  // 'max_touch_move_in_pixels_for_click' pixels.
+  return ui::GestureConfiguration::max_touch_move_in_pixels_for_click() - 1;
+}
+
 }  // namespace content