cc/blimp: Add synchronization for scroll/scale state.

cc/trees/layer_tree.cc

 // 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 "cc/trees/layer_tree.h"
 
 #include "base/auto_reset.h"
 #include "base/time/time.h"
 #include "cc/animation/animation_host.h"
 #include "cc/input/page_scale_animation.h"
@@ skipping 405 matching lines @@
   tree_impl->set_painted_device_scale_factor(
       inputs_.painted_device_scale_factor);
 
   tree_impl->SetDeviceColorSpace(inputs_.device_color_space);
 
   if (inputs_.pending_page_scale_animation) {
     tree_impl->SetPendingPageScaleAnimation(
         std::move(inputs_.pending_page_scale_animation));
   }
 
+  if (inputs_.reflected_main_frame_state) {
+    tree_impl->SetReflectedMainFrameState(
+        std::move(inputs_.reflected_main_frame_state));
+  }
+
   DCHECK(!tree_impl->ViewportSizeInvalid());
 
   tree_impl->set_has_ever_been_drawn(false);
 }
 
 void LayerTree::ToProtobuf(proto::LayerTree* proto, bool inputs_only) {
   TRACE_EVENT0("cc.remote", "LayerProtoConverter::SerializeLayerHierarchy");
 
   // LayerTree::Inputs Serialization -----------------------------------------
 
@@ skipping 254 matching lines @@
 
 LayerListReverseIterator<Layer> LayerTree::rend() {
   return LayerListReverseIterator<Layer>(nullptr);
 }
 
 void LayerTree::SetNeedsDisplayOnAllLayers() {
   for (auto* layer : *this)
     layer->SetNeedsDisplay();
 }
 
+void LayerTree::SetReflectedMainFrameState(
+    std::unique_ptr<ReflectedMainFrameState> reflected_main_frame_state) {
+  inputs_.reflected_main_frame_state = std::move(reflected_main_frame_state);
+  SetNeedsCommit();
+}
+
 }  // namespace cc