[Extensions] Add metrics for renderer sync IPCs performance

extensions/renderer/runtime_custom_bindings.cc

 // Copyright 2014 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 "extensions/renderer/runtime_custom_bindings.h"
 
 #include <stdint.h>
 
 #include <memory>
 
 #include "base/bind.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/values.h"
 #include "content/public/child/v8_value_converter.h"
 #include "content/public/renderer/render_frame.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/extension_messages.h"
 #include "extensions/common/manifest.h"
 #include "extensions/renderer/extension_frame_helper.h"
 #include "extensions/renderer/script_context.h"
 #include "third_party/WebKit/public/web/WebLocalFrame.h"
 
@@ skipping 37 matching lines @@
   const Extension* extension = context()->extension();
   if (extension && !extension->is_hosted_app())
     info.source_id = extension->id();
 
   info.target_id = *v8::String::Utf8Value(args[0]);
   info.source_url = context()->url();
   std::string channel_name = *v8::String::Utf8Value(args[1]);
   bool include_tls_channel_id =
       args.Length() > 2 ? args[2]->BooleanValue() : false;
   int port_id = -1;
-  // TODO(devlin): This file is littered with sync IPCs. Yuck.
-  renderframe->Send(new ExtensionHostMsg_OpenChannelToExtension(
-      renderframe->GetRoutingID(), info, channel_name, include_tls_channel_id,
-      &port_id));
+  {
+    SCOPED_UMA_HISTOGRAM_TIMER(
+        "Extensions.Messaging.GetPortIdSyncTime.Extension");
+    // TODO(devlin): This file is littered with sync IPCs. Yuck.
+    renderframe->Send(new ExtensionHostMsg_OpenChannelToExtension(
+        renderframe->GetRoutingID(), info, channel_name, include_tls_channel_id,
+        &port_id));
+  }
   args.GetReturnValue().Set(static_cast<int32_t>(port_id));
 }
 
 void RuntimeCustomBindings::OpenChannelToNativeApp(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   // The Javascript code should validate/fill the arguments.
   CHECK_EQ(args.Length(), 1);
   CHECK(args[0]->IsString());
 
   // Verify that the extension has permission to use native messaging.
   if (!context()->GetAvailability("runtime.connectNative").is_available())
     return;
 
   content::RenderFrame* render_frame = context()->GetRenderFrame();
   if (!render_frame)
     return;
 
   std::string native_app_name = *v8::String::Utf8Value(args[0]);
 
   int port_id = -1;
-  render_frame->Send(new ExtensionHostMsg_OpenChannelToNativeApp(
-      render_frame->GetRoutingID(), native_app_name, &port_id));
+  {
+    SCOPED_UMA_HISTOGRAM_TIMER(
+        "Extensions.Messaging.GetPortIdSyncTime.NativeApp");
+    render_frame->Send(new ExtensionHostMsg_OpenChannelToNativeApp(
+        render_frame->GetRoutingID(), native_app_name, &port_id));
+  }
   args.GetReturnValue().Set(static_cast<int32_t>(port_id));
 }
 
 void RuntimeCustomBindings::GetManifest(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   CHECK(context()->extension());
 
   std::unique_ptr<content::V8ValueConverter> converter(
       content::V8ValueConverter::create());
   args.GetReturnValue().Set(converter->ToV8Value(
@@ skipping 64 matching lines @@
       v8::Maybe<bool> maybe =
           v8_views->CreateDataProperty(v8_context, v8_index++, window);
       CHECK(maybe.IsJust() && maybe.FromJust());
     }
   }
 
   args.GetReturnValue().Set(v8_views);
 }
 
 }  // namespace extensions