Introduce intercepting and handling devtools messages in the renderer.

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/base64.h"
 #include "base/basictypes.h"
 #include "base/lazy_instance.h"
 #include "content/browser/child_process_security_policy_impl.h"
 #include "content/browser/devtools/devtools_manager_impl.h"
-#include "content/browser/devtools/render_view_devtools_agent_host.h"
+#include "content/browser/devtools/devtools_protocol.h"
+#include "content/browser/devtools/renderer_overrides_handler.h"
 #include "content/browser/renderer_host/render_process_host_impl.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/site_instance_impl.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/common/devtools_messages.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/browser/javascript_dialog_manager.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_types.h"
 #include "content/public/browser/render_widget_host_view.h"
@@ skipping 105 matching lines @@
 // static
 void RenderViewDevToolsAgentHost::OnCancelPendingNavigation(
     RenderViewHost* pending,
     RenderViewHost* current) {
   int cookie = DevToolsAgentHost::DisconnectRenderViewHost(pending);
   if (cookie != -1)
     DevToolsAgentHost::ConnectRenderViewHost(cookie, current);
 }
 
 RenderViewDevToolsAgentHost::RenderViewDevToolsAgentHost(
-    RenderViewHost* rvh) {
+    RenderViewHost* rvh)
+    : overrides_handler_(new RendererOverridesHandler(this)) {
   ConnectRenderViewHost(rvh, false);
   g_instances.Get().push_back(this);
   RenderViewHostDelegate* delegate = render_view_host_->GetDelegate();
   if (delegate && delegate->GetAsWebContents())
     Observe(delegate->GetAsWebContents());
 }
 
 RenderViewHost* RenderViewDevToolsAgentHost::GetRenderViewHost() {
   return render_view_host_;
 }
 
 void RenderViewDevToolsAgentHost::DispatchOnInspectorBackend(
     const std::string& message) {
-  DevToolsAgentHostImpl::DispatchOnInspectorBackend(message);
+  std::string error_message;
+  scoped_ptr<DevToolsProtocol::Command> command(
+      DevToolsProtocol::ParseCommand(message, &error_message));
+  if (!command) {
+    OnDispatchOnInspectorFrontend(error_message);
+    return;
+  }
+
+  scoped_ptr<DevToolsProtocol::Response> overridden_response(
+      overrides_handler_->HandleCommand(command.get()));
+  if (overridden_response)
+    OnDispatchOnInspectorFrontend(overridden_response->Serialize());
+  else
+    DevToolsAgentHostImpl::DispatchOnInspectorBackend(message);
 }
 
 void RenderViewDevToolsAgentHost::SendMessageToAgent(IPC::Message* msg) {
   msg->set_routing_id(render_view_host_->GetRoutingID());
   render_view_host_->Send(msg);
 }
 
 void RenderViewDevToolsAgentHost::NotifyClientAttaching() {
   if (!render_view_host_)
     return;
@@ skipping 189 matching lines @@
     JavaScriptDialogManager* manager =
         web_contents->GetDelegate()->GetJavaScriptDialogManager();
     if (!manager)
       return false;
     return manager->HandleJavaScriptDialog(web_contents, accept);
   }
   return false;
 }
 
 }  // namespace content