[Extensions Bindings] Request JS execution from messaging bindings

chrome/renderer/extensions/chrome_extensions_renderer_client.cc

Index: chrome/renderer/extensions/chrome_extensions_renderer_client.cc
diff --git a/chrome/renderer/extensions/chrome_extensions_renderer_client.cc b/chrome/renderer/extensions/chrome_extensions_renderer_client.cc
index b1127e949e6dfdc908f093ff19dcd69512884b8a..ebc1fe4faed8828f98d43c8cb42e13e27f880fb3 100644
--- a/chrome/renderer/extensions/chrome_extensions_renderer_client.cc
+++ b/chrome/renderer/extensions/chrome_extensions_renderer_client.cc
@@ -132,6 +132,10 @@ 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(