Change browser/page action default icon defined in manifest to support hidpi.

chrome/browser/ui/views/location_bar/page_action_image_view.h

Index: chrome/browser/ui/views/location_bar/page_action_image_view.h
diff --git a/chrome/browser/ui/views/location_bar/page_action_image_view.h b/chrome/browser/ui/views/location_bar/page_action_image_view.h
index 474b5c4469c66342cb4169333d36eff9aaa76672..af757bcd7981f8109819197f56f27b6a47d96900 100644
--- a/chrome/browser/ui/views/location_bar/page_action_image_view.h
+++ b/chrome/browser/ui/views/location_bar/page_action_image_view.h
@@ -9,7 +9,7 @@
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
-#include "chrome/browser/extensions/image_loading_tracker.h"
+#include "chrome/browser/extensions/extension_action_icon_factory.h"
 #include "chrome/browser/ui/views/extensions/extension_popup.h"
 #include "chrome/common/extensions/extension_action.h"
 #include "ui/views/context_menu_controller.h"
@@ -29,10 +29,10 @@ class MenuRunner;
 // PageActionImageView is used by the LocationBarView to display the icon for a
 // given PageAction and notify the extension when the icon is clicked.
 class PageActionImageView : public views::ImageView,
-                            public ImageLoadingTracker::Observer,
                             public views::WidgetObserver,
                             public views::ContextMenuController,
                             public content::NotificationObserver,
+                            public ExtensionActionIconFactory::Observer,
                             public ExtensionAction::IconAnimation::Observer {
  public:
   PageActionImageView(LocationBarView* owner,
@@ -54,11 +54,6 @@ class PageActionImageView : public views::ImageView,
   virtual void OnMouseReleased(const ui::MouseEvent& event) OVERRIDE;
   virtual bool OnKeyPressed(const ui::KeyEvent& event) OVERRIDE;
 
-  // Overridden from ImageLoadingTracker:
-  virtual void OnImageLoaded(const gfx::Image& image,
-                             const std::string& extension_id,
-                             int index) OVERRIDE;
-
   // Overridden from views::WidgetObserver:
   virtual void OnWidgetClosing(views::Widget* widget) OVERRIDE;
 
@@ -71,6 +66,9 @@ class PageActionImageView : public views::ImageView,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
+  // Overriden from ExtensionActionIconFactory::Observer.
+  virtual void OnIconUpdated() OVERRIDE;
+
   // Overridden from ui::AcceleratorTarget:
   virtual bool AcceleratorPressed(const ui::Accelerator& accelerator) OVERRIDE;
   virtual bool CanHandleAccelerators() const OVERRIDE;
@@ -103,9 +101,10 @@ class PageActionImageView : public views::ImageView,
   // The corresponding browser.
   Browser* browser_;
 
-  // The object that is waiting for the image loading to complete
-  // asynchronously.
-  ImageLoadingTracker tracker_;
+  // The object that page action will use to create icon for us.
+  // It may load icon asynchronously (in which case initial icon returned by
+  // the action will be blank), so we have to observe it for icon's updates.
+  scoped_ptr<ExtensionActionIconFactory> icon_factory_;
 
   // The tab id we are currently showing the icon for.
   int current_tab_id_;