Add UMA to understand the typical total size of ServiceWorker script [1/2 blink]

Source/modules/serviceworkers/ServiceWorkerGlobalScope.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 37 matching lines @@
 #include "modules/serviceworkers/InspectorServiceWorkerCacheAgent.h"
 #include "modules/serviceworkers/ServiceWorkerClients.h"
 #include "modules/serviceworkers/ServiceWorkerGlobalScopeClient.h"
 #include "modules/serviceworkers/ServiceWorkerRegistration.h"
 #include "modules/serviceworkers/ServiceWorkerScriptCachedMetadataHandler.h"
 #include "modules/serviceworkers/ServiceWorkerThread.h"
 #include "modules/serviceworkers/WaitUntilObserver.h"
 #include "platform/network/ResourceRequest.h"
 #include "platform/weborigin/DatabaseIdentifier.h"
 #include "platform/weborigin/KURL.h"
+#include "public/platform/Platform.h"
 #include "public/platform/WebServiceWorkerSkipWaitingCallbacks.h"
 #include "public/platform/WebURL.h"
 #include "wtf/CurrentTime.h"
 
 namespace blink {
 
 class ServiceWorkerGlobalScope::SkipWaitingCallback final : public WebServiceWorkerSkipWaitingCallbacks {
     WTF_MAKE_NONCOPYABLE(SkipWaitingCallback);
 public:
     explicit SkipWaitingCallback(PassRefPtrWillBeRawPtr<ScriptPromiseResolver> resolver)
@@ skipping 19 matching lines @@
     context->applyContentSecurityPolicyFromString(startupData->m_contentSecurityPolicy, startupData->m_contentSecurityPolicyType);
 
     return context.release();
 }
 
 ServiceWorkerGlobalScope::ServiceWorkerGlobalScope(const KURL& url, const String& userAgent, ServiceWorkerThread* thread, double timeOrigin, const SecurityOrigin* starterOrigin, PassOwnPtrWillBeRawPtr<WorkerClients> workerClients)
     : WorkerGlobalScope(url, userAgent, thread, timeOrigin, starterOrigin, workerClients)
     , m_didEvaluateScript(false)
     , m_hadErrorInTopLevelEventHandler(false)
     , m_eventNestingLevel(0)
+    , m_scriptCount(0)
+    , m_scriptTotalSize(0)
+    , m_scriptCachedMetadataTotalSize(0)
 {
     workerInspectorController()->registerModuleAgent(InspectorServiceWorkerCacheAgent::create(this));
 }
 
 ServiceWorkerGlobalScope::~ServiceWorkerGlobalScope()
 {
 }
 
 void ServiceWorkerGlobalScope::didEvaluateWorkerScript()
 {
+    if (Platform* platform = Platform::current()) {
+        platform->histogramCustomCounts("ServiceWorker.ScriptCount", m_scriptCount, 1, 1000, 50);
+        platform->histogramCustomCounts("ServiceWorker.ScriptTotalSize", m_scriptTotalSize, 1000, 5000000, 50);
+        if (m_scriptCachedMetadataTotalSize)
+            platform->histogramCustomCounts("ServiceWorker.ScriptCachedMetadataTotalSize", m_scriptCachedMetadataTotalSize, 1000, 50000000, 50);
+    }
     m_didEvaluateScript = true;
 }
 
 CacheStorage* ServiceWorkerGlobalScope::caches(ExecutionContext* context)
 {
     if (!m_caches) {
         String identifier = createDatabaseIdentifierFromSecurityOrigin(context->securityOrigin());
         ASSERT(!identifier.isEmpty());
         m_caches = CacheStorage::create(Platform::current()->cacheStorage(identifier));
     }
@@ skipping 111 matching lines @@
 
 void ServiceWorkerGlobalScope::logExceptionToConsole(const String& errorMessage, int scriptId, const String& sourceURL, int lineNumber, int columnNumber, PassRefPtrWillBeRawPtr<ScriptCallStack> callStack)
 {
     WorkerGlobalScope::logExceptionToConsole(errorMessage, scriptId, sourceURL, lineNumber, columnNumber, callStack);
     RefPtrWillBeRawPtr<ConsoleMessage> consoleMessage = ConsoleMessage::create(JSMessageSource, ErrorMessageLevel, errorMessage, sourceURL, lineNumber);
     consoleMessage->setScriptId(scriptId);
     consoleMessage->setCallStack(callStack);
     addMessageToWorkerConsole(consoleMessage.release());
 }
 
+void ServiceWorkerGlobalScope::scriptLoaded(size_t scriptSize, size_t cachedMetadataSize)
+{
+    ++m_scriptCount;
+    m_scriptTotalSize += scriptSize;
+    m_scriptCachedMetadataTotalSize += cachedMetadataSize;
+}
+
 } // namespace blink