Make command-zero reset page scale in addition to zoom level

content/renderer/render_view_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_RENDERER_RENDER_VIEW_IMPL_H_
 #define CONTENT_RENDERER_RENDER_VIEW_IMPL_H_
 
 #include <deque>
 #include <map>
 #include <set>
@@ skipping 381 matching lines @@
       const blink::WebRect& touch_rect,
       const blink::WebVector<blink::WebRect>& target_rects);
 #endif
   virtual blink::WebString acceptLanguages();
   virtual void navigateBackForwardSoon(int offset);
   virtual int historyBackListCount();
   virtual int historyForwardListCount();
   virtual blink::WebSpeechRecognizer* speechRecognizer();
   virtual void zoomLimitsChanged(double minimum_level, double maximum_level);
   virtual void zoomLevelChanged();
+  virtual void pageScaleFactorChanged();
   virtual double zoomLevelToZoomFactor(double zoom_level) const;
   virtual double zoomFactorToZoomLevel(double factor) const;
   virtual void registerProtocolHandler(const blink::WebString& scheme,
                                        const blink::WebURL& url,
                                        const blink::WebString& title);
   virtual void unregisterProtocolHandler(const blink::WebString& scheme,
                                          const blink::WebURL& url);
   virtual blink::WebPageVisibilityState visibilityState() const;
   virtual void draggableRegionsChanged();
 
@@ skipping 258 matching lines @@
   void OnSetPageEncoding(const std::string& encoding_name);
   void OnSetRendererPrefs(const RendererPreferences& renderer_prefs);
   void OnSetWebUIProperty(const std::string& name, const std::string& value);
   void OnSetZoomLevelForLoadingURL(const GURL& url, double zoom_level);
   void OnSetZoomLevelForView(bool uses_temporary_zoom_level, double level);
   void OnStopFinding(StopFindAction action);
   void OnSuppressDialogsUntilSwapOut();
   void OnThemeChanged();
   void OnUpdateTargetURLAck();
   void OnUpdateWebPreferences(const WebPreferences& prefs);
+  void OnResetPageScale();
   void OnZoom(PageZoom zoom);
   void OnEnableViewSourceMode();
   void OnWindowSnapshotCompleted(const int snapshot_id,
       const gfx::Size& size, const std::vector<unsigned char>& png);
   void OnForceRedraw(int request_id);
   void OnSelectWordAroundCaret();
 #if defined(OS_ANDROID)
   void OnActivateNearestFindResult(int request_id, float x, float y);
   void OnFindMatchRects(int current_version);
   void OnUndoScrollFocusedEditableNodeIntoRect();
@@ skipping 340 matching lines @@
   // session, this info is sent to the browser along with other drag/drop info.
   DragEventSourceInfo possible_drag_event_info_;
 
   // NOTE: stats_collection_observer_ should be the last members because their
   // constructors call the AddObservers method of RenderViewImpl.
   scoped_ptr<StatsCollectionObserver> stats_collection_observer_;
 
   typedef std::map<cc::SharedBitmapId, cc::SharedBitmap*> BitmapMap;
   BitmapMap disambiguation_bitmaps_;
 
+  bool page_scale_factor_is_one_;
+
   // ---------------------------------------------------------------------------
   // ADDING NEW DATA? Please see if it fits appropriately in one of the above
   // sections rather than throwing it randomly at the end. If you're adding a
   // 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);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_VIEW_IMPL_H_