Add the ability for DevTools to wrap network transactions.

content/common/devtools_messages.h

 // Copyright (c) 2012 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.
 
 // Developer tools consist of the following parts:
 //
 // DevToolsAgent lives in the renderer of an inspected page and provides access
 // to the pages resources, DOM, v8 etc. by means of IPC messages.
 //
 // DevToolsClient is a thin delegate that lives in the tools front-end
@@ skipping 99 matching lines @@
 // cross-navigation instrumentation.
 IPC_MESSAGE_ROUTED1(DevToolsHostMsg_SaveAgentRuntimeState,
                     std::string /* state */)
 
 // Clears browser cache.
 IPC_MESSAGE_ROUTED0(DevToolsHostMsg_ClearBrowserCache)
 
 // Clears browser cookies.
 IPC_MESSAGE_ROUTED0(DevToolsHostMsg_ClearBrowserCookies)
 
+// Disables / reenables network.
+IPC_MESSAGE_ROUTED1(DevToolsHostMsg_DisableNetwork,
+                    bool /* disable */)
+
 //-----------------------------------------------------------------------------
 // These are messages sent from the GPU process to the inspected renderer.
 
 IPC_STRUCT_BEGIN(GpuTaskInfo)
   IPC_STRUCT_MEMBER(double, timestamp)
   IPC_STRUCT_MEMBER(int, phase)
   IPC_STRUCT_MEMBER(bool, foreign)
   IPC_STRUCT_MEMBER(uint64, gpu_memory_used_bytes)
   IPC_STRUCT_MEMBER(uint64, gpu_memory_limit_bytes)
 IPC_STRUCT_END()
 
 // Recorded events are passed in chunks to the renderer process.
 IPC_MESSAGE_ROUTED1(DevToolsAgentMsg_GpuTasksChunk,
                     std::vector<GpuTaskInfo> /* gpu_tasks */)
 
 //-----------------------------------------------------------------------------
 // These are messages sent from the inspected page renderer to the worker
 // renderer.