DevTools: pass agent host id to the renderer (content).

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 44 matching lines @@
 // These are messages sent from DevToolsAgent to DevToolsClient through the
 // browser.
 // WebKit-level transport.
 IPC_MESSAGE_ROUTED1(DevToolsClientMsg_DispatchOnInspectorFrontend,
                     std::string /* message */)
 
 //-----------------------------------------------------------------------------
 // These are messages sent from DevToolsClient to DevToolsAgent through the
 // browser.
 // Tells agent that there is a client host connected to it.
-IPC_MESSAGE_ROUTED0(DevToolsAgentMsg_Attach)
+IPC_MESSAGE_ROUTED1(DevToolsAgentMsg_Attach,
+                    std::string /* host_id */)
 
 // Tells agent that a client host was disconnected from another agent and
 // connected to this one.
-IPC_MESSAGE_ROUTED1(DevToolsAgentMsg_Reattach,
+IPC_MESSAGE_ROUTED2(DevToolsAgentMsg_Reattach,
+                    std::string /* host_id */,
                     std::string /* agent_state */)
 
 // Tells agent that there is no longer a client host connected to it.
 IPC_MESSAGE_ROUTED0(DevToolsAgentMsg_Detach)
 
 // WebKit-level transport.
 IPC_MESSAGE_ROUTED1(DevToolsAgentMsg_DispatchOnInspectorBackend,
                     std::string /* message */)
 
 // Inspect element with the given coordinates.
-IPC_MESSAGE_ROUTED2(DevToolsAgentMsg_InspectElement,
+IPC_MESSAGE_ROUTED3(DevToolsAgentMsg_InspectElement,
+                    std::string /* host_id */,
                     int /* x */,
                     int /* y */)
 
 // Add message to the devtools console.
 IPC_MESSAGE_ROUTED2(DevToolsAgentMsg_AddMessageToConsole,
                     content::ConsoleMessageLevel /* level */,
                     std::string /* message */)
 
 // Worker DevTools agent should resume worker execution.
 IPC_MESSAGE_ROUTED0(DevToolsAgentMsg_ResumeWorkerContext)
@@ skipping 31 matching lines @@
   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.