[DRAFT] Add new default stylesheet for platform apps.

chrome/renderer/extensions/platform_app_dispatcher.cc

+// Copyright (c) 2011 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/renderer/extensions/platform_app_dispatcher.h"
+
+#include "base/logging.h"
+#include "grit/renderer_resources.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "chrome/common/extensions/platform_app_messages.h"
+
+using WebKit::WebString;
+using WebKit::WebView;
+using WebKit::WebVector;
+
+PlatformAppDispatcher::PlatformAppDispatcher() {
+}
+
+PlatformAppDispatcher::~PlatformAppDispatcher() {
+}
+
+bool PlatformAppDispatcher::OnControlMessageReceived(
+    const IPC::Message& message) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(PlatformAppDispatcher, message)
+      IPC_MESSAGE_HANDLER(PlatformAppMsg_IsPlatformApp, OnIsPlatformApp)
+      IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+
+  return handled;
+}
+
+void PlatformAppDispatcher::OnIsPlatformApp() {
+  WebString scheme(WebString::fromUTF8("chrome-extension://*/*"));
+  WebVector<WebString> patterns;
+  patterns.assign(&scheme, 1);
+  WebView::addUserStyleSheet(
+      WebString::fromUTF8(ResourceBundle::GetSharedInstance().
+                          GetRawDataResource(IDR_PLATFORM_APP_CSS)),
+      patterns,
+      WebView::UserContentInjectInAllFrames,
+      WebView::UserStyleInjectInExistingDocuments);
+}