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

content/public/browser/host_zoom_map.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_PUBLIC_BROWSER_HOST_ZOOM_MAP_H_
 #define CONTENT_PUBLIC_BROWSER_HOST_ZOOM_MAP_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 19 matching lines @@
 // for host with specific scheme. Setting any of the levels leaves settings
 // for other settings intact. Getting the zoom level starts at the most
 // specific setting and progresses to the less specific: first the zoom for the
 // host and scheme pair is checked, secondly the zoom for the host only and
 // lastly default zoom.
 
 class HostZoomMap {
  public:
   // Enum that indicates what was the scope of zoom level change.
   enum ZoomLevelChangeMode {
-    ZOOM_CHANGED_FOR_HOST,            // Zoom level changed for host.
-    ZOOM_CHANGED_FOR_SCHEME_AND_HOST, // Zoom level changed for scheme/host
-                                      // pair.
-    ZOOM_CHANGED_TEMPORARY_ZOOM,      // Temporary zoom change for specific
-                                      // renderer, no scheme/host is specified.
+    ZOOM_CHANGED_FOR_HOST,             // Zoom level changed for host.
+    ZOOM_CHANGED_FOR_SCHEME_AND_HOST,  // Zoom level changed for scheme/host
+                                       // pair.
+    ZOOM_CHANGED_TEMPORARY_ZOOM,       // Temporary zoom change for specific
+                                       // renderer, no scheme/host is specified.
+    PAGE_SCALE_IS_ONE_CHANGED,         // Page scale factor equal to one changed
+                                       // for a host.
   };
 
   // Structure used to notify about zoom changes. Host and/or scheme are empty
   // if not applicable to |mode|.
   struct ZoomLevelChange {
     ZoomLevelChangeMode mode;
     std::string host;
     std::string scheme;
     double zoom_level;
   };
@@ skipping 15 matching lines @@
   // Returns the HostZoomMap associated with this WebContent's main frame. If
   // multiple WebContents share the same SiteInstance, then they share a single
   // HostZoomMap.
   CONTENT_EXPORT static HostZoomMap* GetForWebContents(
       const WebContents* contents);
 
   // Returns the current zoom level for the specified WebContents. May be
   // temporary or host-specific.
   CONTENT_EXPORT static double GetZoomLevel(const WebContents* web_contents);
 
+  // Returns true if the page scale factor for the WebContents is one.
+  CONTENT_EXPORT static bool PageScaleFactorIsOne(
+      const WebContents* web_contents);
+
   // Sets the current zoom level for the specified WebContents. The level may
   // be temporary or host-specific depending on the particular WebContents.
   CONTENT_EXPORT static void SetZoomLevel(const WebContents* web_contents,
                                           double level);
 
   // Send an IPC to refresh any displayed error page's zoom levels. Needs to
   // be called since error pages don't get loaded via the normal channel.
   CONTENT_EXPORT static void SendErrorPageZoomLevelRefresh(
       const WebContents* web_contents);
 
+  // Set or clear whether or not the page scale factor for a view is one.
+  virtual void SetPageScaleFactorIsOneForView(
+      int render_process_id, int render_view_id, bool is_one) = 0;
+  virtual void ClearPageScaleFactorIsOneForView(
+      int render_process_id, int render_view_id) = 0;
+
   // Copy the zoom levels from the given map. Can only be called on the UI
   // thread.
   virtual void CopyFrom(HostZoomMap* copy) = 0;
 
   // Here |host| is the host portion of URL, or (in the absence of a host)
   // the complete spec of the URL.
   // Returns the zoom for the specified |scheme| and |host|. See class
   // description for details.
   //
   // This may be called on any thread.
@@ skipping 62 matching lines @@
   virtual scoped_ptr<Subscription> AddZoomLevelChangedCallback(
       const ZoomLevelChangedCallback& callback) = 0;
 
  protected:
   virtual ~HostZoomMap() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_HOST_ZOOM_MAP_H_