[Extensions] Cache extension action icons

chrome/browser/extensions/extension_action_icon_factory_unittest.cc

 // 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.
 
 #include "chrome/browser/extensions/extension_action_icon_factory.h"
 
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/json/json_file_value_serializer.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 245 matching lines @@
   ASSERT_FALSE(browser_action->default_icon());
   ASSERT_TRUE(browser_action->GetExplicitlySetIcon(0 /*tab id*/).isNull());
 
   gfx::Image default_icon =
       EnsureImageSize(LoadIcon("browser_action/no_icon/icon.png"), 19);
   ASSERT_FALSE(default_icon.IsEmpty());
 
   scoped_ptr<ExtensionIconSet> default_icon_set(new ExtensionIconSet());
   default_icon_set->Add(19, "icon.png");
 
-  browser_action->set_default_icon(default_icon_set.Pass());
+  browser_action->SetDefaultIconForTest(default_icon_set.Pass());
   ASSERT_TRUE(browser_action->default_icon());
 
   ExtensionActionIconFactory icon_factory(
       profile(), extension.get(), browser_action, this);
 
   gfx::Image icon = icon_factory.GetIcon(0);
 
   // The icon should be loaded asynchronously. Initially a transparent icon
   // should be returned.
   EXPECT_TRUE(ImageRepsAreEqual(
@@ skipping 13 matching lines @@
   icon = icon_factory.GetIcon(1);
 
   EXPECT_TRUE(ImageRepsAreEqual(
       default_icon.ToImageSkia()->GetRepresentation(1.0f),
       icon.ToImageSkia()->GetRepresentation(1.0f)));
 
 }
 
 }  // namespace
 }  // namespace extensions