[animation-worklet] invoke animate callback on mutation signal

third_party/WebKit/Source/web/AnimationWorkletProxyClientImpl.cpp

Index: third_party/WebKit/Source/web/AnimationWorkletProxyClientImpl.cpp
diff --git a/third_party/WebKit/Source/web/AnimationWorkletProxyClientImpl.cpp b/third_party/WebKit/Source/web/AnimationWorkletProxyClientImpl.cpp
index f5095fe81c02fa0c11e849b15e3f8c2276a00fb8..15004ad94602c4c5568f8ef34012950a6eea92e4 100644
--- a/third_party/WebKit/Source/web/AnimationWorkletProxyClientImpl.cpp
+++ b/third_party/WebKit/Source/web/AnimationWorkletProxyClientImpl.cpp
@@ -21,12 +21,30 @@ DEFINE_TRACE(AnimationWorkletProxyClientImpl) {
   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;
 }