[Extensions] Add metrics for renderer sync IPCs performance

chrome/renderer/extensions/tabs_custom_bindings.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 "chrome/renderer/extensions/tabs_custom_bindings.h"
 
 #include <stdint.h>
 
 #include <string>
 
 #include "base/bind.h"
+#include "base/metrics/histogram_macros.h"
 #include "content/public/renderer/render_frame.h"
 #include "extensions/common/extension_messages.h"
 #include "extensions/renderer/script_context.h"
 #include "v8/include/v8.h"
 
 namespace extensions {
 
 TabsCustomBindings::TabsCustomBindings(ScriptContext* context)
     : ObjectBackedNativeHandler(context) {
   RouteFunction("OpenChannelToTab", "tabs",
@@ skipping 19 matching lines @@
         args[1]->IsInt32() &&
         args[2]->IsString() &&
         args[3]->IsString());
 
   ExtensionMsg_TabTargetConnectionInfo info;
   info.tab_id = args[0]->Int32Value();
   info.frame_id = args[1]->Int32Value();
   std::string extension_id = *v8::String::Utf8Value(args[2]);
   std::string channel_name = *v8::String::Utf8Value(args[3]);
   int port_id = -1;
-  render_frame->Send(new ExtensionHostMsg_OpenChannelToTab(
-      render_frame->GetRoutingID(), info, extension_id, channel_name,
-      &port_id));
+  {
+    SCOPED_UMA_HISTOGRAM_TIMER("Extensions.Messaging.GetPortIdSyncTime.Tab");
+    render_frame->Send(new ExtensionHostMsg_OpenChannelToTab(
+        render_frame->GetRoutingID(), info, extension_id, channel_name,
+        &port_id));
+  }
   args.GetReturnValue().Set(static_cast<int32_t>(port_id));
 }
 
 }  // namespace extensions