[animation-worklet] invoke animate callback on mutation signal

third_party/WebKit/Source/web/AnimationWorkletProxyClientImpl.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "web/AnimationWorkletProxyClientImpl.h"
 
 #include "core/dom/CompositorProxy.h"
 #include "platform/graphics/CompositorMutableStateProvider.h"
 #include "web/CompositorMutatorImpl.h"
 
 namespace blink {
 
 AnimationWorkletProxyClientImpl::AnimationWorkletProxyClientImpl(
     CompositorMutatorImpl* mutator)
     : mutator_(mutator) {
   DCHECK(IsMainThread());
 }
 
 DEFINE_TRACE(AnimationWorkletProxyClientImpl) {
   AnimationWorkletProxyClient::Trace(visitor);
   CompositorAnimator::Trace(visitor);
 }
 
+void AnimationWorkletProxyClientImpl::SetGlobalScope(
+    WorkletGlobalScope* scope) {
+  DCHECK(!IsMainThread());
+  DCHECK(scope);
+  global_scope_ = static_cast<AnimationWorkletGlobalScope*>(scope);
+  mutator_->RegisterCompositorAnimator(this);
+}
+
+void AnimationWorkletProxyClientImpl::Dispose() {
+  // At worklet scope termination break the reference cycle between
+  // CompositorMutatorImpl and AnimationProxyClientImpl and also the cycle
+  // between AnimationWorkletGlobalScope and AnimationWorkletProxyClientImpl.
+  mutator_->UnregisterCompositorAnimator(this);
+  global_scope_ = nullptr;
+}
+
 bool AnimationWorkletProxyClientImpl::Mutate(
     double monotonic_time_now,
     CompositorMutableStateProvider* provider) {
   DCHECK(!IsMainThread());
   // TODO(majidvp): actually call JS |animate| callbacks.
 
+  if (global_scope_)
+    global_scope_->Mutate();
   // Always request another rAF for now.
   return true;
 }
 
 }  // namespace blink