[Extensions] Add metrics for renderer sync IPCs performance

extensions/renderer/i18n_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/i18n_custom_bindings.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
+#include "base/metrics/histogram_macros.h"
 #include "content/public/child/v8_value_converter.h"
 #include "content/public/renderer/render_frame.h"
 #include "content/public/renderer/render_thread.h"
 #include "extensions/common/extension_messages.h"
 #include "extensions/common/message_bundle.h"
 #include "extensions/renderer/script_context.h"
 #include "extensions/renderer/v8_helpers.h"
 #include "third_party/cld/cld_version.h"
 
 #if BUILDFLAG(CLD_VERSION) == 2
@@ skipping 169 matching lines @@
   }
 
   L10nMessagesMap* l10n_messages = GetL10nMessagesMap(extension_id);
   if (!l10n_messages) {
     content::RenderFrame* render_frame = context()->GetRenderFrame();
     if (!render_frame)
       return;
 
     L10nMessagesMap messages;
     // A sync call to load message catalogs for current extension.
-    render_frame->Send(
-        new ExtensionHostMsg_GetMessageBundle(extension_id, &messages));
+    {
+      SCOPED_UMA_HISTOGRAM_TIMER("Extensions.SyncGetMessageBundle");
+      render_frame->Send(
+          new ExtensionHostMsg_GetMessageBundle(extension_id, &messages));
+    }
 
     // Save messages we got.
     ExtensionToL10nMessagesMap& l10n_messages_map =
         *GetExtensionToL10nMessagesMap();
     l10n_messages_map[extension_id] = messages;
 
     l10n_messages = GetL10nMessagesMap(extension_id);
   }
 
   std::string message_name = *v8::String::Utf8Value(args[0]);
@@ skipping 82 matching lines @@
   // Populate LanguageDetectionResult with prediction reliability, languages,
   // and the corresponding percentages.
   InitDetectedLanguages(lang_results, &result);
   args.GetReturnValue().Set(result.ToValue(context()));
 #else
 # error "CLD_VERSION must be 2 or 3"
 #endif
 }
 
 }  // namespace extensions