[WIP] Worklet: Merge MainThreadWorklet and ThreadedWorklet into Worklet

third_party/WebKit/Source/modules/compositorworker/AnimationWorklet.cpp

Index: third_party/WebKit/Source/modules/compositorworker/AnimationWorklet.cpp
diff --git a/third_party/WebKit/Source/modules/compositorworker/AnimationWorklet.cpp b/third_party/WebKit/Source/modules/compositorworker/AnimationWorklet.cpp
index 46b241a92bd60318d905151325dff4da0096c20a..67eb30f2c9d69ed6bfe3aa6c267048c1d6fb92a5 100644
--- a/third_party/WebKit/Source/modules/compositorworker/AnimationWorklet.cpp
+++ b/third_party/WebKit/Source/modules/compositorworker/AnimationWorklet.cpp
@@ -19,40 +19,31 @@ AnimationWorklet* AnimationWorklet::Create(LocalFrame* frame) {
   return new AnimationWorklet(frame);
 }
 
-AnimationWorklet::AnimationWorklet(LocalFrame* frame)
-    : ThreadedWorklet(frame), worklet_messaging_proxy_(nullptr) {}
+AnimationWorklet::AnimationWorklet(LocalFrame* frame) : Worklet(frame) {}
 
 AnimationWorklet::~AnimationWorklet() {
-  if (worklet_messaging_proxy_)
-    worklet_messaging_proxy_->ParentObjectDestroyed();
+  // The proxy outlives the worklet as it is used to perform thread shutdown,
+  // it deletes itself once this has occurred.
+  // TODO(nhiroki):
 }
 
-void AnimationWorklet::Initialize() {
-  AnimationWorkletThread::EnsureSharedBackingThread();
+bool AnimationWorklet::NeedsToCreateGlobalScope() {
+  // In the current impl, we create only one global scope.
+  return !GetNumberOfGlobalScopes();
+}
 
-  DCHECK(!worklet_messaging_proxy_);
-  DCHECK(GetExecutionContext());
+std::unique_ptr<WorkletGlobalScopeProxy> AnimationWorklet::CreateGlobalScope() {
+  AnimationWorkletThread::EnsureSharedBackingThread();
   Document* document = ToDocument(GetExecutionContext());
   AnimationWorkletProxyClient* proxy_client =
       document->GetFrame()->GetChromeClient().CreateAnimationWorkletProxyClient(
           document->GetFrame());
-
-  worklet_messaging_proxy_ =
-      new AnimationWorkletMessagingProxy(GetExecutionContext(), proxy_client);
-  worklet_messaging_proxy_->Initialize();
-}
-
-bool AnimationWorklet::IsInitialized() const {
-  return worklet_messaging_proxy_;
-}
-
-WorkletGlobalScopeProxy* AnimationWorklet::GetWorkletGlobalScopeProxy() const {
-  DCHECK(worklet_messaging_proxy_);
-  return worklet_messaging_proxy_;
+  return WTF::MakeUnique<AnimationWorkletMessagingProxy>(GetExecutionContext(),
+                                                         proxy_client);
 }
 
 DEFINE_TRACE(AnimationWorklet) {
-  ThreadedWorklet::Trace(visitor);
+  Worklet::Trace(visitor);
 }
 
 }  // namespace blink