Add support for LayerTreeSettings (de)serialization

cc/trees/layer_tree_settings.h

 // 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.
 
 #ifndef CC_TREES_LAYER_TREE_SETTINGS_H_
 #define CC_TREES_LAYER_TREE_SETTINGS_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "cc/base/cc_export.h"
 #include "cc/debug/layer_tree_debug_state.h"
 #include "cc/output/managed_memory_policy.h"
 #include "cc/output/renderer_settings.h"
 #include "cc/scheduler/scheduler_settings.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace cc {
 
+namespace proto {
+class LayerTreeSettings;
+}  // namespace proto
+
 class CC_EXPORT LayerTreeSettings {
  public:
   LayerTreeSettings();
   virtual ~LayerTreeSettings();
 
   RendererSettings renderer_settings;
   bool single_thread_proxy_scheduler;
   bool use_external_begin_frame_source;
   bool main_frame_before_activation_enabled;
   bool using_synchronous_renderer_compositor;
@@ skipping 43 matching lines @@
   bool verify_property_trees;
   bool use_property_trees;
   bool image_decode_tasks_enabled;
   bool use_compositor_animation_timelines;
   bool wait_for_beginframe_interval;
   int max_staging_buffer_usage_in_bytes;
   ManagedMemoryPolicy memory_policy_;
 
   LayerTreeDebugState initial_debug_state;
 
+  bool operator==(const LayerTreeSettings& other) const;

[vmpstr, 2015/12/08 18:26:13]

Can you put these above all of the variables. Also, while here can you put
ToSchedulerSettings above as well?

[nyquist, 2015/12/08 22:44:58]

Done.

+
+  void ToProtobuf(proto::LayerTreeSettings* proto) const;
+  void FromProtobuf(const proto::LayerTreeSettings& proto);
+
   SchedulerSettings ToSchedulerSettings() const;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_SETTINGS_H_