[Extensions] Add renderer-side logic to short circuit activity logging

extensions/common/extension_messages.h

 // 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.
 
 // IPC messages for extensions.
 // Multiply-included message file, hence no include guard.
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 834 matching lines @@
                     base::string16 /* selector */)
 
 // Result of a query selector request.
 // result_acc_obj_id is the accessibility tree ID of the result element; 0
 // indicates no result.
 IPC_MESSAGE_ROUTED3(ExtensionHostMsg_AutomationQuerySelector_Result,
                     int /* request_id */,
                     ExtensionHostMsg_AutomationQuerySelector_Error /* error */,
                     int /* result_acc_obj_id */)
 
+// Tells the renderer whether or not activity logging is enabled. This is only
+// sent if logging is or was previously enabled; not being enabled is assumed
+// otherwise.
+IPC_MESSAGE_CONTROL1(ExtensionMsg_SetActivityLoggingEnabled, bool /* enabled */)
+
 // Messages related to Extension Service Worker.
 #undef IPC_MESSAGE_START
 #define IPC_MESSAGE_START ExtensionWorkerMsgStart
 // A service worker thread sends this message when an extension service worker
 // starts an API request. The browser will always respond with a
 // ExtensionMsg_ResponseWorker.
 IPC_MESSAGE_CONTROL1(ExtensionHostMsg_RequestWorker,
                      ExtensionHostMsg_Request_Params)
 
 // The browser sends this message in response to all service worker extension
 // api calls. The response data (if any) is one of the base::Value subclasses,
 // wrapped as the first element in a ListValue.
 IPC_MESSAGE_CONTROL5(ExtensionMsg_ResponseWorker,
                      int /* thread_id */,
                      int /* request_id */,
                      bool /* success */,
                      base::ListValue /* response wrapper (see comment above) */,
                      std::string /* error */)