Enable pinch-zoom telemetry on Mac

content/browser/renderer_host/input/synthetic_pinch_gesture.h

-// Copyright 2013 The Chromium Authors. All rights reserved.
+// Copyright 2015 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 CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_PINCH_GESTURE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_PINCH_GESTURE_H_
 
 #include "base/time/time.h"
 #include "content/browser/renderer_host/input/synthetic_gesture.h"
 #include "content/browser/renderer_host/input/synthetic_gesture_target.h"
 #include "content/common/content_export.h"
 #include "content/common/input/synthetic_pinch_gesture_params.h"
-#include "content/common/input/synthetic_web_input_event_builders.h"
-#include "third_party/WebKit/public/web/WebInputEvent.h"
 
 namespace content {
 
+// SyntheticPinchGesture is a thin wrapper around either
+// SyntheticTouchscreenPinchGesture or SyntheticTouchpadPinchGesture, depending
+// on the SyntheticGestureParam's |input_type| and the default input type of the
+// target.
 class CONTENT_EXPORT SyntheticPinchGesture : public SyntheticGesture {
  public:
   explicit SyntheticPinchGesture(const SyntheticPinchGestureParams& params);
   ~SyntheticPinchGesture() override;
 
   SyntheticGesture::Result ForwardInputEvents(
       const base::TimeTicks& timestamp,
       SyntheticGestureTarget* target) override;
 
  private:
-  enum GestureState {
-    SETUP,
-    STARTED,
-    MOVING,
-    DONE
-  };
+  SyntheticPinchGestureParams params_;
+  scoped_ptr<SyntheticGesture> lazy_gesture_;
 
-  void ForwardTouchInputEvents(const base::TimeTicks& timestamp,
-                               SyntheticGestureTarget* target);
-
-  void UpdateTouchPoints(const base::TimeTicks& timestamp);
-  void PressTouchPoints(SyntheticGestureTarget* target,
-                        const base::TimeTicks& timestamp);
-  void MoveTouchPoints(SyntheticGestureTarget* target, float delta,
-                       const base::TimeTicks& timestamp);
-  void ReleaseTouchPoints(SyntheticGestureTarget* target,
-                          const base::TimeTicks& timestamp);
-  void ForwardTouchEvent(SyntheticGestureTarget* target,
-                         const base::TimeTicks& timestamp);
-
-  void SetupCoordinatesAndStopTime(SyntheticGestureTarget* target);
-  float GetDeltaForPointer0AtTime(const base::TimeTicks& timestamp) const;
-  base::TimeTicks ClampTimestamp(const base::TimeTicks& timestamp) const;
-  bool HasReachedTarget(const base::TimeTicks& timestamp) const;
-
-  SyntheticPinchGestureParams params_;
-  float start_y_0_;
-  float start_y_1_;
-  float max_pointer_delta_0_;
-  SyntheticGestureParams::GestureSourceType gesture_source_type_;
-  GestureState state_;
-  SyntheticWebTouchEvent touch_event_;
-  base::TimeTicks start_time_;
-  base::TimeTicks stop_time_;
-
- private:
   DISALLOW_COPY_AND_ASSIGN(SyntheticPinchGesture);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_PINCH_GESTURE_H_