Support GestureBegin and GestureEnd in ui::GestureProvider

ui/events/gesture_detection/gesture_provider.h

 // 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.
 
 #ifndef UI_EVENTS_GESTURE_DETECTION_GESTURE_PROVIDER_H_
 #define UI_EVENTS_GESTURE_DETECTION_GESTURE_PROVIDER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/events/gesture_detection/gesture_detection_export.h"
@@ skipping 14 matching lines @@
 // Given a stream of |MotionEvent|'s, provides gesture detection and gesture
 // event dispatch.
 class GESTURE_DETECTION_EXPORT GestureProvider {
  public:
   struct GESTURE_DETECTION_EXPORT Config {
     Config();
     ~Config();
     GestureDetector::Config gesture_detector_config;
     ScaleGestureDetector::Config scale_gesture_detector_config;
     SnapScrollController::Config snap_scroll_controller_config;
+
+    // There is normally a delay before a tap event is fired, in order to allow

[jdduke (slow), 2014/04/04 19:08:36]

Nit: |When double-tap support is enabled, there will always be a delay before a
tap event is fired...|.

[tdresser, 2014/04/07 13:42:55]

Done.

+    // the double tap gesture to occur without firing any tap events. If
+    // |disable_click_delay| is true, there will be no delay before a tap event
+    // is fired.
     bool disable_click_delay;
+
+    // If |gesture_begin_end_types_enabled| is true, fire an ET_GESTURE_BEGIN
+    // event for every added touch point, and an ET_GESTURE_END event for every
+    // removed touch point.
+    bool gesture_begin_end_types_enabled;
   };
 
   GestureProvider(const Config& config, GestureProviderClient* client);
   ~GestureProvider();
 
   // Handle the incoming MotionEvent, returning false if the event could not
   // be handled.
   bool OnTouchEvent(const MotionEvent& event);
 
   // Resets all gesture detectors; called on DidStartLoading().
@@ skipping 44 matching lines @@
   void Fling(base::TimeTicks time,
              float x,
              float y,
              float velocity_x,
              float velocity_y);
   void Send(const GestureEventData& gesture);
   void SendTapCancelIfNecessary(const MotionEvent& event);
   bool SendLongTapIfNecessary(const MotionEvent& event);
   void EndTouchScrollIfNecessary(base::TimeTicks time,
                                  bool send_scroll_end_event);
+  void OnTouchEventHandlingBegin(const MotionEvent& event);
+  void OnTouchEventHandlingEnd(const MotionEvent& event);
+
   void UpdateDoubleTapDetectionSupport();
 
   GestureProviderClient* const client_;
 
   class GestureListenerImpl;
   friend class GestureListenerImpl;
   scoped_ptr<GestureListenerImpl> gesture_listener_;
 
   class ScaleGestureListenerImpl;
   friend class ScaleGestureListenerImpl;
@@ skipping 16 matching lines @@
   bool pinch_in_progress_;
 
   // Whether double-tap gesture detection is currently supported.
   bool double_tap_support_for_page_;
   bool double_tap_support_for_platform_;
 
   // Keeps track of the current GESTURE_LONG_PRESS event. If a context menu is
   // opened after a GESTURE_LONG_PRESS, this is used to insert a
   // GESTURE_TAP_CANCEL for removing any ::active styling.
   base::TimeTicks current_longpress_time_;
+
+  bool gesture_begin_end_types_enabled_;
 };
 
 }  //  namespace ui
 
 #endif  // UI_EVENTS_GESTURE_DETECTION_GESTURE_PROVIDER_H_