Enable pinch-zoom telemetry 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/IOSurface.h>
 #include <list>
@@ skipping 323 matching lines @@
   void GetScreenInfo(blink::WebScreenInfo* results) override;
   bool GetScreenColorProfile(std::vector<char>* color_profile) override;
   gfx::Rect GetBoundsInRootWindow() override;
   gfx::GLSurfaceHandle GetCompositingSurface() override;
 
   bool LockMouse() override;
   void UnlockMouse() override;
   void WheelEventAck(const blink::WebMouseWheelEvent& event,
                      InputEventAckState ack_result) override;
 
+  scoped_ptr<SyntheticGestureTarget> CreateSyntheticGestureTarget() override;
+
   uint32_t GetSurfaceIdNamespace() override;
   uint32_t SurfaceIdNamespaceAtPoint(const gfx::Point& point,
                                      gfx::Point* transformed_point) override;
   void ProcessMouseEvent(const blink::WebMouseEvent& event) override;
   void ProcessMouseWheelEvent(const blink::WebMouseWheelEvent& event) override;
 
   // IPC::Sender implementation.
   bool Send(IPC::Message* message) override;
 
   // gfx::DisplayObserver implementation.
@@ skipping 240 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_