Attempt to load component extension favicon from the resources first.

chrome/browser/extensions/extension_icon_manager_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 "base/json/json_file_value_serializer.h"
 #include "base/message_loop.h"
 #include "base/path_service.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/extension_icon_manager.h"
 #include "chrome/common/chrome_paths.h"
@@ skipping 119 matching lines @@
 
   // Now re-load the icon - we should get the same result bitmap (and not the
   // default icon).
   icon_manager.LoadIcon(extension.get());
   WaitForImageLoad();
   SkBitmap second_icon = icon_manager.GetIcon(extension->id());
   EXPECT_FALSE(gfx::BitmapsAreEqual(second_icon, default_icon));
 
   EXPECT_TRUE(gfx::BitmapsAreEqual(first_icon, second_icon));
 }
+
+#if defined(FILE_MANAGER_EXTENSION)
+// Tests loading an icon for a component extension.
+TEST_F(ExtensionIconManagerTest, LoadComponentExtensionResource) {
+  SkBitmap default_icon = GetDefaultIcon();
+
+  FilePath test_dir;
+  ASSERT_TRUE(PathService::Get(chrome::DIR_TEST_DATA, &test_dir));
+  FilePath manifest_path = test_dir.AppendASCII(
+      "extensions/file_manager/app.json");
+
+  JSONFileValueSerializer serializer(manifest_path);
+  scoped_ptr<DictionaryValue> manifest(
+      static_cast<DictionaryValue*>(serializer.Deserialize(NULL, NULL)));
+  ASSERT_TRUE(manifest.get() != NULL);
+
+  std::string error;
+  scoped_refptr<Extension> extension(Extension::Create(
+      manifest_path.DirName(), Extension::COMPONENT, *manifest.get(),
+      Extension::STRICT_ERROR_CHECKS, &error));
+  ASSERT_TRUE(extension.get());
+
+  TestIconManager icon_manager(this);
+  // Load the icon and grab the bitmap.
+  icon_manager.LoadIcon(extension.get());
+  WaitForImageLoad();
+  SkBitmap first_icon = icon_manager.GetIcon(extension->id());
+  EXPECT_FALSE(gfx::BitmapsAreEqual(first_icon, default_icon));
+
+  // Remove the icon from the manager.
+  icon_manager.RemoveIcon(extension->id());
+
+  // Now re-load the icon - we should get the same result bitmap (and not the
+  // default icon).
+  icon_manager.LoadIcon(extension.get());
+  WaitForImageLoad();
+  SkBitmap second_icon = icon_manager.GetIcon(extension->id());
+  EXPECT_FALSE(gfx::BitmapsAreEqual(second_icon, default_icon));
+
+  EXPECT_TRUE(gfx::BitmapsAreEqual(first_icon, second_icon));
+}
+#endif