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

chrome/browser/extensions/extension_action_icon_factory.h

Index: chrome/browser/extensions/extension_action_icon_factory.h
diff --git a/chrome/browser/extensions/extension_action_icon_factory.h b/chrome/browser/extensions/extension_action_icon_factory.h
new file mode 100644
index 0000000000000000000000000000000000000000..b07c6e01047714f78a2cc4499af56f1931776996
--- /dev/null
+++ b/chrome/browser/extensions/extension_action_icon_factory.h
@@ -0,0 +1,43 @@
+// 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 CHROME_BROWSER_EXTENSIONS_EXTENSION_ACTION_ICON_FACTORY_H_
+#define CHROME_BROWSER_EXTENSIONS_EXTENSION_ACTION_ICON_FACTORY_H_
+
+#include "chrome/common/extensions/extension_action.h"
+
+class ExtensionActionIcon;
+class ExtensionIconSet;
+
+namespace extensions {
+class Extension;
+}
+
+class ExtensionActionIconFactory : public ExtensionAction::IconFactory {
+ public:
+  class Observer {
+   public:
+    virtual ~Observer() {}
+    virtual void OnIconUpdated() = 0;
+  };
+
+  // Observer should outlive this.
+  ExtensionActionIconFactory(const extensions::Extension* extension,
+                             Observer* observer);
+  virtual ~ExtensionActionIconFactory();
+
+  // ExtensionAction::IconWrapperFactory override.
+  virtual gfx::ImageSkia GetIcon(const ExtensionIconSet* icon_set,
+                                 ExtensionAction::Type) OVERRIDE;
+
+ private:
+  const extensions::Extension* extension_;
+  Observer* observer_;
+  const ExtensionIconSet* last_icon_set_;
+  scoped_ptr<ExtensionActionIcon> icon_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExtensionActionIconFactory);
+};
+
+#endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_ACTION_ICON_FACTORY_H_