DevTools: use explicit IPC messages for enabling/disabling tracing instead of intercepting protocol…

content/browser/devtools/render_view_devtools_agent_host.cc

 // 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.
 
 #include "content/browser/devtools/render_view_devtools_agent_host.h"
 
 #include "base/basictypes.h"
 #include "base/lazy_instance.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/browser/child_process_security_policy_impl.h"
@@ skipping 423 matching lines @@
     const IPC::Message& msg) {
   if (!render_view_host_)
     return false;
 
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(RenderViewDevToolsAgentHost, msg)
     IPC_MESSAGE_HANDLER(DevToolsClientMsg_DispatchOnInspectorFrontend,
                         OnDispatchOnInspectorFrontend)
     IPC_MESSAGE_HANDLER(DevToolsHostMsg_SaveAgentRuntimeState,
                         OnSaveAgentRuntimeState)
+    IPC_MESSAGE_HANDLER(DevToolsHostMsg_EnableTracing, OnEnableTracing)
+    IPC_MESSAGE_HANDLER(DevToolsHostMsg_DisableTracing, OnDisableTracing)
     IPC_MESSAGE_HANDLER_GENERIC(ViewHostMsg_SwapCompositorFrame,
                                 handled = false; OnSwapCompositorFrame(msg))
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 void RenderViewDevToolsAgentHost::OnSwapCompositorFrame(
     const IPC::Message& message) {
   ViewHostMsg_SwapCompositorFrame::Param param;
@@ skipping 13 matching lines @@
     const std::string& state) {
   if (!render_view_host_)
     return;
   state_ = state;
 }
 
 void RenderViewDevToolsAgentHost::OnDispatchOnInspectorFrontend(
     const std::string& message) {
   if (!render_view_host_)
     return;
-
-  scoped_refptr<DevToolsProtocol::Notification> notification =
-      DevToolsProtocol::ParseNotification(message);
-
-  if (notification.get()) {
-    tracing_handler_->HandleNotification(notification);
-  }
   SendMessageToClient(message);
 }
 
+void RenderViewDevToolsAgentHost::OnEnableTracing(
+    const std::string& category_filter) {
+  tracing_handler_->EnableTracing(category_filter);
+}
+
+void RenderViewDevToolsAgentHost::OnDisableTracing() {
+  tracing_handler_->DisableTracing();
+}
+
 }  // namespace content