Add GesturePinchBegin/End events on Mac

content/browser/renderer_host/render_widget_host_view_mac.h

 // Copyright (c) 2012 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_RENDER_WIDGET_HOST_VIEW_MAC_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 #include <IOSurface/IOSurfaceAPI.h>
 #include <list>
@@ skipping 130 matching lines @@
 
   // Whether or not plugin IME is currently enabled active.
   BOOL pluginImeActive_;
 
   // Whether the previous mouse event was ignored due to hitTest check.
   BOOL mouseEventWasIgnored_;
 
   // Event monitor for scroll wheel end event.
   id endWheelMonitor_;
 
+  // When a gesture starts, the system does not inform the view of which type
+  // of gesture is happening (magnify, rotate, etc), rather, it just informs
+  // the view that some as-yet-undefined gesture is starting. Capture the
+  // information about the gesture's beginning event here. It will be used to
+  // create a specific gesture begin event later.
+  scoped_ptr<blink::WebGestureEvent> gestureBeginEvent_;
+
+  // This is set if a GesturePinchBegin event has been sent in the lifetime of
+  // |gestureBeginEvent_|. If set, a GesturePinchEnd will be sent when the
+  // gesture ends.
+  BOOL gestureBeginPinchSent_;
+
   // If true then escape key down events are suppressed until the first escape
   // key up event. (The up event is suppressed as well). This is used by the
   // flash fullscreen code to avoid sending a key up event without a matching
   // key down event.
   BOOL suppressNextEscapeKeyUp_;
 
   // The set of key codes from key down events that we haven't seen the matching
   // key up events yet.
   // Used for filtering out non-matching NSKeyUp events.
   std::set<unsigned short> keyDownCodes_;
@@ skipping 399 matching lines @@
 
   // Factory used to safely scope delayed calls to ShutdownHost().
   base::WeakPtrFactory<RenderWidgetHostViewMac> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewMac);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_MAC_H_