Handle mac trackpad zoom via GesturePinch events

content/browser/web_contents/web_contents_impl.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_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 468 matching lines @@
       RenderWidgetHostImpl* render_widget_host) OVERRIDE;
   virtual bool PreHandleKeyboardEvent(
       const NativeWebKeyboardEvent& event,
       bool* is_keyboard_shortcut) OVERRIDE;
   virtual void HandleKeyboardEvent(
       const NativeWebKeyboardEvent& event) OVERRIDE;
   virtual bool HandleWheelEvent(
       const blink::WebMouseWheelEvent& event) OVERRIDE;
   virtual bool PreHandleGestureEvent(
       const blink::WebGestureEvent& event) OVERRIDE;
+  virtual bool HandleGestureEvent(
+      const blink::WebGestureEvent& event) OVERRIDE;
   virtual void DidSendScreenRects(RenderWidgetHostImpl* rwh) OVERRIDE;
 #if defined(OS_WIN)
   virtual gfx::NativeViewAccessible GetParentNativeViewAccessible() OVERRIDE;
 #endif
 
   // RenderFrameHostManager::Delegate ------------------------------------------
 
   virtual bool CreateRenderViewForRenderManager(
       RenderViewHost* render_view_host,
       int opener_route_id,
@@ skipping 478 matching lines @@
   bool closed_by_user_gesture_;
 
   // Minimum/maximum zoom percent.
   int minimum_zoom_percent_;
   int maximum_zoom_percent_;
   // If true, the default zoom limits have been overriden for this tab, in which
   // case we don't want saved settings to apply to it and we don't want to
   // remember it.
   bool temporary_zoom_settings_;
 
+  // The raw accumulated zoom value and the actual zoom increments made for an
+  // an in-progress pinch gesture.
+  float totalPinchGestureAmount_;
+  int currentPinchZoomStepDelta_;
+
   // The intrinsic size of the page.
   gfx::Size preferred_size_;
 
   // The preferred size for content screen capture.  When |capturer_count_| > 0,
   // this overrides |preferred_size_|.
   gfx::Size preferred_size_for_capture_;
 
 #if defined(OS_ANDROID)
   // Date time chooser opened by this tab.
   // Only used in Android since all other platforms use a multi field UI.
@@ skipping 43 matching lines @@
   // Whether this WebContents is responsible for displaying a subframe in a
   // different process from its parent page.
   bool is_subframe_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_