Remove custom counts histogram from the blink API.

third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp

 /*
  * Copyright (C) 2013 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 28 matching lines @@
 #include "core/inspector/WorkerInspectorController.h"
 #include "core/loader/FrameLoadRequest.h"
 #include "core/workers/WorkerClients.h"
 #include "core/workers/WorkerGlobalScope.h"
 #include "core/workers/WorkerInspectorProxy.h"
 #include "core/workers/WorkerLoaderProxy.h"
 #include "core/workers/WorkerScriptLoader.h"
 #include "core/workers/WorkerThreadStartupData.h"
 #include "modules/serviceworkers/ServiceWorkerContainerClient.h"
 #include "modules/serviceworkers/ServiceWorkerThread.h"
+#include "platform/Histogram.h"
 #include "platform/SharedBuffer.h"
 #include "platform/heap/Handle.h"
 #include "platform/network/ContentSecurityPolicyParsers.h"
 #include "platform/network/ContentSecurityPolicyResponseHeaders.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebURLRequest.h"
 #include "public/platform/modules/serviceworker/WebServiceWorkerProvider.h"
 #include "public/web/WebDevToolsAgent.h"
 #include "public/web/WebSettings.h"
 #include "public/web/WebView.h"
@@ skipping 247 matching lines @@
         return;
 
     if (m_mainScriptLoader->failed()) {
         m_mainScriptLoader.clear();
         // This deletes 'this'.
         m_workerContextClient->workerContextFailedToStart();
         return;
     }
     m_workerContextClient->workerScriptLoaded();
 
-    Platform::current()->histogramCustomCounts("ServiceWorker.ScriptSize", m_mainScriptLoader->script().length(), 1000, 5000000, 50);
-    if (m_mainScriptLoader->cachedMetadata())
-        Platform::current()->histogramCustomCounts("ServiceWorker.ScriptCachedMetadataSize", m_mainScriptLoader->cachedMetadata()->size(), 1000, 50000000, 50);
+    DEFINE_THREAD_SAFE_STATIC_LOCAL(CustomCountHistogram, scriptSizeHistogram, new CustomCountHistogram("ServiceWorker.ScriptSize", 1000, 5000000, 50));

[nhiroki, 2016/02/05 00:55:41]

This function is called only on the main thread (a worker thread will start at
line 324), so _THREAD_SAFE_ is not necessary.

+    scriptSizeHistogram.count(m_mainScriptLoader->script().length());
+    if (m_mainScriptLoader->cachedMetadata()) {
+        DEFINE_THREAD_SAFE_STATIC_LOCAL(CustomCountHistogram, scriptCachedMetadataSizeHistogram, new CustomCountHistogram("ServiceWorker.ScriptCachedMetadataSize", 1000, 50000000, 50));
+        scriptCachedMetadataSizeHistogram.count(m_mainScriptLoader->cachedMetadata()->size());
+    }
 
     startWorkerThread();
 }
 
 void WebEmbeddedWorkerImpl::startWorkerThread()
 {
     ASSERT(!m_askedToTerminate);
 
     Document* document = m_mainFrame->frame()->document();
 
@@ skipping 27 matching lines @@
     m_mainScriptLoader.clear();
 
     m_workerGlobalScopeProxy = ServiceWorkerGlobalScopeProxy::create(*this, *document, *m_workerContextClient);
     m_loaderProxy = WorkerLoaderProxy::create(this);
     m_workerThread = ServiceWorkerThread::create(m_loaderProxy, *m_workerGlobalScopeProxy);
     m_workerThread->start(startupData.release());
     m_workerInspectorProxy->workerThreadCreated(document, m_workerThread.get(), scriptURL);
 }
 
 } // namespace blink