Zoom Extension API

chrome/browser/ui/zoom/zoom_controller.h

Index: chrome/browser/ui/zoom/zoom_controller.h
diff --git a/chrome/browser/ui/zoom/zoom_controller.h b/chrome/browser/ui/zoom/zoom_controller.h
index 3c427a716d6956b4603ee54f1d1fe67dd4780985..b042b42acd5686a683e95c0ad0825cafff2a368c 100644
--- a/chrome/browser/ui/zoom/zoom_controller.h
+++ b/chrome/browser/ui/zoom/zoom_controller.h
@@ -11,6 +11,7 @@
 #include "content/public/browser/host_zoom_map.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
+#include "extensions/common/extension.h"
 
 class ZoomObserver;
 
@@ -32,8 +33,17 @@ class ZoomController : public content::WebContentsObserver,
   // Returns which image should be loaded for the current zoom level.
   int GetResourceForZoomLevel() const;
 
+  const extensions::Extension* last_extension() const;
+
   void set_observer(ZoomObserver* observer) { observer_ = observer; }
 
+  // Sets the zoom level through WebContents::SetZoomLevel(). Returns a boolean
+  // flag indicating success (true) or failure (false).
+  bool SetZoomLevelByExtension(
+      double zoom_level,
+      scoped_refptr<const extensions::Extension> extension,
+      const base::Callback<void(void)>& callback);
+
   // content::WebContentsObserver overrides:
   virtual void DidNavigateMainFrame(
       const content::LoadCommittedDetails& details,
@@ -51,6 +61,12 @@ class ZoomController : public content::WebContentsObserver,
   // meaning the change should apply to ~all sites. If it is not empty, the
   // change only affects sites with the given host.
   void UpdateState(const std::string& host);
+  void UpdateState(const std::string& host, bool is_temporary_zoom);
+
+  // This function serves as a callback that will be called after a zoom
+  // change has completed that is initiated from SetZoomLevelByExtension().
+  void ZoomCallback(scoped_refptr<const extensions::Extension> extension,
+                    const base::Callback<void(void)>& callback);
 
   // The current zoom percentage.
   int zoom_percent_;
@@ -58,6 +74,14 @@ class ZoomController : public content::WebContentsObserver,
   // Used to access the default zoom level preference.
   DoublePrefMember default_zoom_level_;
 
+  // Keeps track of the extension (if any) that initiated the last zoom change
+  // that took effect.
+  scoped_refptr<const extensions::Extension> last_extension_;
+
+  // Temporary buffer that stores the extension (if any) that initiated the zoom
+  // change that the ZoomController is about to be notified about.
+  scoped_refptr<const extensions::Extension> pending_extension_;
+
   // Observer receiving notifications on state changes.
   ZoomObserver* observer_;