[Extensions Bindings] Request JS execution from messaging bindings

extensions/shell/renderer/shell_extensions_renderer_client.cc

Index: extensions/shell/renderer/shell_extensions_renderer_client.cc
diff --git a/extensions/shell/renderer/shell_extensions_renderer_client.cc b/extensions/shell/renderer/shell_extensions_renderer_client.cc
index c3be35072878088bbcbb6821637e1600c6aa3ecc..251c30353e7d6662233f9661ce16e133df778ed2 100644
--- a/extensions/shell/renderer/shell_extensions_renderer_client.cc
+++ b/extensions/shell/renderer/shell_extensions_renderer_client.cc
@@ -4,10 +4,15 @@
 
 #include "extensions/shell/renderer/shell_extensions_renderer_client.h"
 
+#include "base/memory/ptr_util.h"
+#include "extensions/renderer/dispatcher.h"
+#include "extensions/renderer/dispatcher_delegate.h"
+
 namespace extensions {
 
-ShellExtensionsRendererClient::ShellExtensionsRendererClient() {
-}
+ShellExtensionsRendererClient::ShellExtensionsRendererClient()
+    : dispatcher_delegate_(base::MakeUnique<DispatcherDelegate>()),
+      dispatcher_(base::MakeUnique<Dispatcher>(dispatcher_delegate_.get())) {}
 
 ShellExtensionsRendererClient::~ShellExtensionsRendererClient() {
 }
@@ -24,4 +29,8 @@ int ShellExtensionsRendererClient::GetLowestIsolatedWorldId() const {
   return 1;
 }
 
+Dispatcher* ShellExtensionsRendererClient::GetDispatcher() {
+  return dispatcher_.get();
+}
+
 }  // namespace extensions