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

content/public/browser/host_zoom_map.h

Index: content/public/browser/host_zoom_map.h
diff --git a/content/public/browser/host_zoom_map.h b/content/public/browser/host_zoom_map.h
index 653d24882fe0c5532e15524bf44129373748f276..a4aca1d232f6a97423333490ad242b6d32e06842 100644
--- a/content/public/browser/host_zoom_map.h
+++ b/content/public/browser/host_zoom_map.h
@@ -37,11 +37,13 @@ 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
@@ -77,6 +79,10 @@ class HostZoomMap {
   // 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,
@@ -87,6 +93,12 @@ class HostZoomMap {
   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;