Worklet: Move Worklet::Initialize() into ThreadedWorklet for cleanup

third_party/WebKit/Source/core/workers/ThreadedWorklet.h

Index: third_party/WebKit/Source/core/workers/ThreadedWorklet.h
diff --git a/third_party/WebKit/Source/core/workers/ThreadedWorklet.h b/third_party/WebKit/Source/core/workers/ThreadedWorklet.h
index bb418d1ba039784b3c7feb310c1bdbbc179e78fe..4c4d92d1252ce877dbf5e53a1e6dc810da92967b 100644
--- a/third_party/WebKit/Source/core/workers/ThreadedWorklet.h
+++ b/third_party/WebKit/Source/core/workers/ThreadedWorklet.h
@@ -29,6 +29,10 @@ class CORE_EXPORT ThreadedWorklet : public Worklet,
  public:
   virtual ~ThreadedWorklet() = default;
 
+  // Called when addModule() is called for the first time.
+  virtual void Initialize() = 0;

[kouhei (in TOK), 2017/04/26 10:47:37]

Can we rename Initialize method to more descriptive name?
Suggestion: InitializeBackingThreadAndProxy()

[nhiroki, 2017/04/26 11:01:46]

SG. Let me rename this in a separate CL because it requires wider changes
(including AnimationWorklet, CompositorWorklet and AudioWorklet)

+  virtual bool IsInitialized() const = 0;
+
   // Worklet
   ScriptPromise addModule(ScriptState*, const String& url) final;