Enable Shadow DOM and scoped stylesheet for extensions and Web UI.

chrome/renderer/extensions/extension_dispatcher.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/renderer/extensions/extension_dispatcher.h"
 
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/string_piece.h"
@@ skipping 33 matching lines @@
 #include "chrome/renderer/extensions/webstore_bindings.h"
 #include "chrome/renderer/module_system.h"
 #include "chrome/renderer/native_handler.h"
 #include "chrome/renderer/resource_bundle_source_map.h"
 #include "content/public/renderer/render_thread.h"
 #include "content/public/renderer/render_view.h"
 #include "grit/renderer_resources.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDataSource.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDocument.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebRuntimeFeatures.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebScopedUserGesture.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebSecurityPolicy.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebString.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebURLRequest.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "v8/include/v8.h"
 
 using WebKit::WebDataSource;
 using WebKit::WebDocument;
@@ skipping 186 matching lines @@
   return handled;
 }
 
 void ExtensionDispatcher::WebKitInitialized() {
   // For extensions, we want to ensure we call the IdleHandler every so often,
   // even if the extension keeps up activity.
   if (is_extension_process_) {
     forced_idle_timer_.Start(FROM_HERE,
         base::TimeDelta::FromMilliseconds(kMaxExtensionIdleHandlerDelayMs),
         RenderThread::Get(), &RenderThread::IdleHandler);
+    // Enables shadow DOM and scoped stylesheet only for extensions.
+    // This allows extension developes to try thiese features without

[Aaron Boodman, 2012/05/15 18:30:56]

typo: these

+    // worrying about flag settings and to keep these hidden from the
+    // wild Web at the same time. This should be eventually removed
+    // once these feature is enabled by default.
+    WebKit::WebRuntimeFeatures::enableShadowDOM(true);

[Aaron Boodman, 2012/05/15 18:30:56]

A static flag is not going to be sufficient. A single process can host both
extension and non-extension WebViews.

Take a look at extension_webkit_preferences.cc for an example of how other
WebKit runtime flags are switched on.

+    WebKit::WebRuntimeFeatures::enableStyleScoped(true);
   }
 
   // Initialize host permissions for any extensions that were activated before
   // WebKit was initialized.
   for (std::set<std::string>::iterator iter = active_extension_ids_.begin();
        iter != active_extension_ids_.end(); ++iter) {
     const Extension* extension = extensions_.GetByID(*iter);
     if (extension)
       InitOriginPermissions(extension);
   }
@@ skipping 629 matching lines @@
     static const char kMessage[] =
         "%s can only be used in an extension process.";
     std::string error_msg = base::StringPrintf(kMessage, function_name.c_str());
     v8::ThrowException(
         v8::Exception::Error(v8::String::New(error_msg.c_str())));
     return false;
   }
 
   return true;
 }