Avoid exposing cc::Layer tree to CompositorProxy

third_party/WebKit/Source/web/CompositorMutatorImpl.cpp

Index: third_party/WebKit/Source/web/CompositorMutatorImpl.cpp
diff --git a/third_party/WebKit/Source/web/CompositorMutatorImpl.cpp b/third_party/WebKit/Source/web/CompositorMutatorImpl.cpp
index ff18628f88a1cfdcc13aef1fcbeabafd68dae2b1..f8c223c5622acc7334ebd25a51d94f79e536bb2c 100644
--- a/third_party/WebKit/Source/web/CompositorMutatorImpl.cpp
+++ b/third_party/WebKit/Source/web/CompositorMutatorImpl.cpp
@@ -96,4 +96,19 @@ void CompositorMutatorImpl::SetNeedsMutate() {
   client_->SetNeedsMutate();
 }
 
+void CompositorMutatorImpl::RegisterCompositorProxy(
+    const CompositorProxy* proxy) {
+  TRACE_EVENT0("compositor-worker",
+               "CompositorMutatorImpl::registerCompositorProxy");
+  client_->RegisterCompositorProxy(proxy->ProxyId(), proxy->ElementId(),
+                                   proxy->CompositorMutableProperties());
+}
+
+void CompositorMutatorImpl::UnregisterCompositorProxy(
+    const CompositorProxy* proxy) {
+  TRACE_EVENT0("compositor-worker",
+               "CompositorMutatorImpl::unregisterCompositorProxy");
+  client_->UnregisterCompositorProxy(proxy->ProxyId());
+}
+
 }  // namespace blink