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

Source/modules/serviceworkers/ServiceWorkerGlobalScope.h

Index: Source/modules/serviceworkers/ServiceWorkerGlobalScope.h
diff --git a/Source/modules/serviceworkers/ServiceWorkerGlobalScope.h b/Source/modules/serviceworkers/ServiceWorkerGlobalScope.h
index d27d9893820a4a0f82de5a554737d8d85c7bea7a..6928430576bfb59e191b4cfc826bcfbbab32b33a 100644
--- a/Source/modules/serviceworkers/ServiceWorkerGlobalScope.h
+++ b/Source/modules/serviceworkers/ServiceWorkerGlobalScope.h
@@ -97,9 +97,10 @@ private:
     class SkipWaitingCallback;
 
     ServiceWorkerGlobalScope(const KURL&, const String& userAgent, ServiceWorkerThread*, double timeOrigin, const SecurityOrigin*, PassOwnPtrWillBeRawPtr<WorkerClients>);
-    virtual void importScripts(const Vector<String>& urls, ExceptionState&) override;
-    virtual PassOwnPtr<CachedMetadataHandler> createWorkerScriptCachedMetadataHandler(const KURL& scriptURL, const Vector<char>* metaData);
-    virtual void logExceptionToConsole(const String& errorMessage, int scriptId, const String& sourceURL, int lineNumber, int columnNumber, PassRefPtrWillBeRawPtr<ScriptCallStack>) override;
+    void importScripts(const Vector<String>& urls, ExceptionState&) override;
+    PassOwnPtr<CachedMetadataHandler> createWorkerScriptCachedMetadataHandler(const KURL& scriptURL, const Vector<char>* metaData) override;
+    void logExceptionToConsole(const String& errorMessage, int scriptId, const String& sourceURL, int lineNumber, int columnNumber, PassRefPtrWillBeRawPtr<ScriptCallStack>) override;
+    void scriptLoaded(size_t scriptSize, size_t cachedMetadataSize) override;
 
     PersistentWillBeMember<ServiceWorkerClients> m_clients;
     PersistentWillBeMember<ServiceWorkerRegistration> m_registration;
@@ -107,6 +108,9 @@ private:
     bool m_didEvaluateScript;
     bool m_hadErrorInTopLevelEventHandler;
     unsigned m_eventNestingLevel;
+    size_t m_scriptCount;
+    size_t m_scriptTotalSize;
+    size_t m_scriptCachedMetadataTotalSize;
 };
 
 } // namespace blink