[Extensions Bindings] Request JS execution from messaging bindings

chrome/renderer/extensions/chrome_extensions_renderer_client.cc

 // Copyright 2014 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/chrome_extensions_renderer_client.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 114 matching lines @@
 }
 
 bool ChromeExtensionsRendererClient::IsIncognitoProcess() const {
   return ChromeRenderThreadObserver::is_incognito_process();
 }
 
 int ChromeExtensionsRendererClient::GetLowestIsolatedWorldId() const {
   return chrome::ISOLATED_WORLD_ID_EXTENSIONS;
 }
 
+extensions::Dispatcher* ChromeExtensionsRendererClient::GetDispatcher() {
+  return extension_dispatcher_.get();
+}
+
 void ChromeExtensionsRendererClient::RenderThreadStarted() {
   content::RenderThread* thread = content::RenderThread::Get();
   extension_dispatcher_delegate_.reset(
       new ChromeExtensionsDispatcherDelegate());
   // ChromeRenderViewTest::SetUp() creates its own ExtensionDispatcher and
   // injects it using SetExtensionDispatcher(). Don't overwrite it.
   if (!extension_dispatcher_) {
     extension_dispatcher_.reset(
         new extensions::Dispatcher(extension_dispatcher_delegate_.get()));
   }
@@ skipping 160 matching lines @@
 
 void ChromeExtensionsRendererClient::RunScriptsAtDocumentEnd(
     content::RenderFrame* render_frame) {
   extension_dispatcher_->RunScriptsAtDocumentEnd(render_frame);
 }
 
 void ChromeExtensionsRendererClient::RunScriptsAtDocumentIdle(
     content::RenderFrame* render_frame) {
   extension_dispatcher_->RunScriptsAtDocumentIdle(render_frame);
 }