Update from https://crrev.com/320343

cc/trees/single_thread_proxy.cc

 // Copyright 2011 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 "cc/trees/single_thread_proxy.h"
 
 #include "base/auto_reset.h"
 #include "base/trace_event/trace_event.h"
 #include "cc/debug/benchmark_instrumentation.h"
 #include "cc/debug/devtools_instrumentation.h"
@@ skipping 531 matching lines @@
     LayerTreeHostImpl::FrameData frame;
     DoComposite(frame_begin_time, &frame);
 
     // DoComposite could abort, but because this is a synchronous composite
     // another draw will never be scheduled, so break remaining promises.
     layer_tree_host_impl_->active_tree()->BreakSwapPromises(
         SwapPromise::SWAP_FAILS);
   }
 }
 
-void SingleThreadProxy::AsValueInto(
-    base::trace_event::TracedValue* state) const {
-  // The following line casts away const modifiers because it is just
-  // setting debug state. We still want the AsValue() function and its
-  // call chain to be const throughout.
-  DebugScopedSetImplThread impl(const_cast<SingleThreadProxy*>(this));
-
-  state->BeginDictionary("layer_tree_host_impl");
-  layer_tree_host_impl_->AsValueInto(state);
-  state->EndDictionary();
-}
-
 void SingleThreadProxy::ForceSerializeOnSwapBuffers() {
   {
     DebugScopedSetImplThread impl(this);
     if (layer_tree_host_impl_->renderer()) {
       DCHECK(!layer_tree_host_->output_surface_lost());
       layer_tree_host_impl_->renderer()->DoNoOp();
     }
   }
 }
 
@@ skipping 256 matching lines @@
 
 void SingleThreadProxy::DidBeginImplFrameDeadline() {
   layer_tree_host_impl_->ResetCurrentBeginFrameArgsForNextFrame();
 }
 
 void SingleThreadProxy::SendBeginFramesToChildren(const BeginFrameArgs& args) {
   layer_tree_host_->SendBeginFramesToChildren(args);
 }
 
 }  // namespace cc