Begin to enable extension APIs in Extension Service Worker.

extensions/renderer/request_sender.h

Index: extensions/renderer/request_sender.h
diff --git a/extensions/renderer/request_sender.h b/extensions/renderer/request_sender.h
index 85a7ef3ed27edded829cbb62e20b8f1c1de27354..01615641aeecad32ce0fbe01ef81ef5a6d1e7d77 100644
--- a/extensions/renderer/request_sender.h
+++ b/extensions/renderer/request_sender.h
@@ -12,10 +12,16 @@
 #include "base/memory/linked_ptr.h"
 #include "v8/include/v8.h"
 
+struct ExtensionHostMsg_Request_Params;
+
 namespace base {
 class ListValue;
 }
 
+namespace content {
+class RenderFrame;
+}
+
 namespace extensions {
 class ScriptContext;
 
@@ -57,7 +63,7 @@ class RequestSender {
   };
 
   RequestSender();
-  ~RequestSender();
+  virtual ~RequestSender();
 
   // In order to avoid collision, all |request_id|s passed into StartRequest()
   // should be generated by this method.
@@ -76,6 +82,12 @@ class RequestSender {
                     bool for_io_thread,
                     base::ListValue* value_args);
 
+  // Sends the IPC to extension host for the API function that is described
+  // in |params|.
+  virtual void SendRequest(content::RenderFrame* render_frame,
+                           bool for_io_thread,
+                           ExtensionHostMsg_Request_Params& params);
+
   // Handles responses from the extension host to calls made by StartRequest().
   void HandleResponse(int request_id,
                       bool success,