Add support for LayerTreeSettings (de)serialization

cc/trees/layer_tree_settings.h

Index: cc/trees/layer_tree_settings.h
diff --git a/cc/trees/layer_tree_settings.h b/cc/trees/layer_tree_settings.h
index 9fb59cba3b4c1f6301bf75f7eeb46ffc059eb8ec..eb6e938b6bebf6629e09e8e097e0873bd706cfdf 100644
--- a/cc/trees/layer_tree_settings.h
+++ b/cc/trees/layer_tree_settings.h
@@ -18,6 +18,10 @@
 
 namespace cc {
 
+namespace proto {
+class LayerTreeSettings;
+}  // namespace proto
+
 class CC_EXPORT LayerTreeSettings {
  public:
   LayerTreeSettings();
@@ -81,6 +85,11 @@ class CC_EXPORT LayerTreeSettings {
 
   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;
 };