Only deliver extension messages to contexts that care.

chrome/renderer/extensions/renderer_extension_bindings.h

Index: chrome/renderer/extensions/renderer_extension_bindings.h
diff --git a/chrome/renderer/extensions/renderer_extension_bindings.h b/chrome/renderer/extensions/renderer_extension_bindings.h
index 29df94a720d0bf2e6c143969b7e1f0a07b68f80a..021611e7733478bf12be8446dda1b121f1728cdd 100644
--- a/chrome/renderer/extensions/renderer_extension_bindings.h
+++ b/chrome/renderer/extensions/renderer_extension_bindings.h
@@ -6,7 +6,10 @@
 #define CHROME_RENDERER_EXTENSIONS_RENDERER_EXTENSION_BINDINGS_H_
 #pragma once
 
+#include <string>
+
 class ExtensionDispatcher;
+class RenderView;
 
 namespace v8 {
 class Extension;
@@ -21,6 +24,12 @@ class RendererExtensionBindings {
 
   // Creates an instance of the extension.
   static v8::Extension* Get(ExtensionDispatcher* dispatcher);
+
+  // Delivers a message sent using content script messaging. If
+  // restrict_to_render_view is specified, only contexts in that render view
+  // will receive the message.
+  static void DeliverMessage(int target_port_id, const std::string& message,
+                             RenderView* restrict_to_render_view);
 };
 
 #endif  // CHROME_RENDERER_EXTENSIONS_RENDERER_EXTENSION_BINDINGS_H_