Add support for touch based zoom gesture on Windows. This change also handles the WM_POINTERDOWN

content/renderer/render_view_impl.h

 // Copyright (c) 2011 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_RENDERER_RENDER_VIEW_IMPL_H_
 #define CONTENT_RENDERER_RENDER_VIEW_IMPL_H_
 #pragma once
 
 #include <deque>
 #include <map>
@@ skipping 841 matching lines @@
   void OnUndo();
   void OnUpdateTargetURLAck();
   void OnUpdateWebPreferences(const WebPreferences& prefs);
 
 #if defined(OS_MACOSX)
   void OnWindowFrameChanged(const gfx::Rect& window_frame,
                             const gfx::Rect& view_frame);
   void OnSelectPopupMenuItem(int selected_index);
 #endif
   void OnZoom(content::PageZoom zoom);
+  void OnZoomFactor(content::PageZoom zoom, int zoom_center_x,
+                    int zoom_center_y);
+
   void OnEnableViewSourceMode();
 
   void OnJavaBridgeInit(const IPC::ChannelHandle& channel_handle);
 
   // Adding a new message handler? Please add it in alphabetical order above
   // and put it in the same position in the .cc file.
 
   // Misc private functions ----------------------------------------------------
+  void ZoomFactorHelper(content::PageZoom zoom, int zoom_center_x,
+                        int zoom_center_y, float scaling_increment);
 
   void AltErrorPageFinished(WebKit::WebFrame* frame,
                             const WebKit::WebURLError& original_error,
                             const std::string& html);
 
   // Check whether the preferred size has changed.
   void CheckPreferredSize();
 
   // This callback is triggered when DownloadFavicon completes, either
   // succesfully or with a failure. See DownloadFavicon for more
@@ skipping 342 matching lines @@
   // bunch of stuff, you should probably create a helper class and put your
   // data and methods on that to avoid bloating RenderView more.  You can
   // use the Observer interface to filter IPC messages and receive frame change
   // notifications.
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewImpl);
 };
 
 #endif  // CONTENT_RENDERER_RENDER_VIEW_IMPL_H_