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

chrome/browser/extensions/extension_action_icon_factory.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 "chrome/common/extensions/extension.h"
+#include "chrome/common/extensions/extension_action.h"
+#include "chrome/common/extensions/extension_icon_set.h"
+#include "grit/theme_resources.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/gfx/image/image_skia.h"
+
+using extensions::Extension;
+using extensions::IconImage;
+
+namespace {
+
+gfx::ImageSkia GetDefaultIcon() {
+  return *ui::ResourceBundle::GetSharedInstance().GetImageNamed(
+      IDR_EXTENSIONS_FAVICON).ToImageSkia();
+}
+
+}  // namespace
+
+ExtensionActionIconFactory::ExtensionActionIconFactory(
+    const Extension* extension,
+    const ExtensionAction* action,
+    Observer* observer)
+    : extension_(extension),
+      action_(action),
+      observer_(observer) {
+}
+
+ExtensionActionIconFactory::~ExtensionActionIconFactory() {}
+
+// extensions::IconImage::Observer overrides.
+void ExtensionActionIconFactory::OnExtensionIconImageChanged(IconImage* image) {
+  if (observer_)
+    observer_->OnIconUpdated();
+}
+
+gfx::Image ExtensionActionIconFactory::GetIcon(int tab_id) {
+  gfx::ImageSkia base_icon = GetBaseIconFromAction(tab_id);
+  return action_->ApplyAttentionAndAnimation(base_icon, tab_id);
+}
+
+gfx::ImageSkia ExtensionActionIconFactory::GetBaseIconFromAction(int tab_id) {
+  gfx::ImageSkia icon = action_->GetExplicitlySetIcon(tab_id);
+  if (!icon.isNull())
+    return icon;
+  if (action_->default_icon()) {
+    // If the icon image has already been created, return its image skia.
+    if (icon_.get())
+      return icon_->image_skia();
+
+    icon_.reset(new IconImage(

[Jeffrey Yasskin, 2012/09/17 20:18:39]

Now that action_ is set in the constructor, please create the IconImage in the
constructor too so that you can simplify the fallback logic here.

[tbarzic, 2012/09/17 22:06:10]

Done.

+        extension_,
+        *action_->default_icon(),
+        ExtensionAction::GetIconSizeForType(action_->action_type()),
+        GetDefaultIcon(),
+        this));
+    return icon_->image_skia();
+  }
+
+  return GetDefaultIcon();
+}
+