[Binding] [UMA] Add a UMA to track time spent in WindowProxy::initialize

third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp

 /*
  * Copyright (C) 2008, 2009, 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 43 matching lines @@
 #include "core/loader/FrameLoader.h"
 #include "core/loader/FrameLoaderClient.h"
 #include "platform/Histogram.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/ScriptForbiddenScope.h"
 #include "platform/TraceEvent.h"
 #include "platform/heap/Handle.h"
 #include "platform/weborigin/SecurityOrigin.h"
 #include "public/platform/Platform.h"
 #include "wtf/Assertions.h"
+#include "wtf/CurrentTime.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/StringExtras.h"
 #include "wtf/text/CString.h"
 #include <algorithm>
 #include <utility>
 #include <v8-debug.h>
 #include <v8.h>
 
 namespace blink {
 
@@ skipping 144 matching lines @@
     if (isContextInitialized())
         return true;
 
     return initialize();
 }
 
 bool WindowProxy::initialize()
 {
     TRACE_EVENT0("v8", "WindowProxy::initialize");
     TRACE_EVENT_SCOPED_SAMPLING_STATE("blink", "InitializeWindow");
+    double startTime = currentTimeMS();

[kouhei (in TOK), 2016/05/24 09:08:12]

use monotonicallyIncreasingTime() instead of currentTimeMS, or better, just use 
SCOPED_BLINK_UMA_HISTOGRAM_TIMER :)

[peria, 2016/05/24 09:36:24]

Oh, I misunderstood the last argument of CustomCountHistogram.
Done.

 
     ScriptForbiddenScope::AllowUserAgentScript allowScript;
 
     v8::HandleScope handleScope(m_isolate);
 
     createContext();
 
     if (!isContextInitialized())
         return false;
 
@@ skipping 24 matching lines @@
     } else {
         updateActivityLogger();
         origin = m_world->isolatedWorldSecurityOrigin();
         setSecurityToken(origin);
     }
     if (m_frame->isLocalFrame()) {
         LocalFrame* frame = toLocalFrame(m_frame);
         MainThreadDebugger::instance()->contextCreated(m_scriptState.get(), frame, origin);
         frame->loader().client()->didCreateScriptContext(context, m_world->extensionGroup(), m_world->worldId());
     }
+
+    double endTime = currentTimeMS();
+    DEFINE_STATIC_LOCAL(CustomCountHistogram, initializeHistogram, ("Blink.Binding.InitializeWindowProxy", 0, 200, 5));
+    initializeHistogram.count(endTime - startTime);
     return true;
 }
 
 void WindowProxy::createContext()
 {
     // FIXME: This should be a null check of m_frame->client(), but there are still some edge cases
     // that this fails to catch during frame detach.
     if (m_frame->isLocalFrame() && !toLocalFrame(m_frame)->loader().documentLoader())
         return;
 
@@ skipping 270 matching lines @@
 }
 
 void WindowProxy::updateSecurityOrigin(SecurityOrigin* origin)
 {
     if (!isContextInitialized())
         return;
     setSecurityToken(origin);
 }
 
 } // namespace blink