Avoid exposing cc::Layer tree to CompositorProxy

third_party/WebKit/Source/web/CompositorWorkerProxyClientImpl.cpp

 // Copyright 2015 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/CompositorWorkerProxyClientImpl.h"
 
 #include "core/dom/CompositorProxy.h"
 #include "modules/compositorworker/CompositorWorkerGlobalScope.h"
 #include "platform/graphics/CompositorMutableStateProvider.h"
 #include "platform/instrumentation/tracing/TraceEvent.h"
@@ skipping 11 matching lines @@
 
  public:
   ScopedCompositorMutableState(
       CompositorProxyClientImpl* compositor_proxy_client,
       CompositorMutableStateProvider* state_provider)
       : compositor_proxy_client_(compositor_proxy_client) {
     DCHECK(!IsMainThread());
     DCHECK(compositor_proxy_client_);
     for (CompositorProxy* proxy : compositor_proxy_client_->Proxies()) {
       proxy->TakeCompositorMutableState(
-          state_provider->GetMutableStateFor(proxy->ElementId()));
+          state_provider->GetMutableStateFor(proxy->ProxyId()));
     }
   }
   ~ScopedCompositorMutableState() {
     for (CompositorProxy* proxy : compositor_proxy_client_->Proxies())
       proxy->TakeCompositorMutableState(nullptr);
   }
 
  private:
   Member<CompositorProxyClientImpl> compositor_proxy_client_;
 };
@@ skipping 70 matching lines @@
 
   DCHECK(global_scope_);
   // Convert to zero based document time in milliseconds consistent with
   // requestAnimationFrame.
   double high_res_time_ms =
       1000.0 * (monotonic_time_now - global_scope_->TimeOrigin());
   return global_scope_->ExecuteAnimationFrameCallbacks(high_res_time_ms);
 }
 
 }  // namespace blink