cc/blimp: Add (de)-serialization for PictureLayer and ScrollbarLayer.

cc/layers/solid_color_scrollbar_layer.h

Index: cc/layers/solid_color_scrollbar_layer.h
diff --git a/cc/layers/solid_color_scrollbar_layer.h b/cc/layers/solid_color_scrollbar_layer.h
index 2855753af5d7a115726401e9794271bb545dd806..60c8f4fb28b9838c1aba7a5cb030dea0c4d721aa 100644
--- a/cc/layers/solid_color_scrollbar_layer.h
+++ b/cc/layers/solid_color_scrollbar_layer.h
@@ -28,6 +28,10 @@ class CC_EXPORT SolidColorScrollbarLayer : public ScrollbarLayerInterface,
   bool OpacityCanAnimateOnImplThread() const override;
   bool AlwaysUseActiveTreeOpacity() const override;
   ScrollbarLayerInterface* ToScrollbarLayer() override;
+  void ToLayerNodeProto(proto::LayerNode* proto) const override;
+  void FromLayerNodeProto(const proto::LayerNode& proto,
+                          const LayerIdMap& layer_map,
+                          LayerTreeHost* layer_tree_host) override;
 
   void SetOpacity(float opacity) override;
   void PushPropertiesTo(LayerImpl* layer) override;
@@ -46,14 +50,16 @@ class CC_EXPORT SolidColorScrollbarLayer : public ScrollbarLayerInterface,
                            int track_start,
                            bool is_left_side_vertical_scrollbar,
                            int scroll_layer_id);
+  SolidColorScrollbarLayer(int engine_layer_id,

[vmpstr, 2016/10/07 23:50:05]

This definitely needs a comment. I also don't understand the engline_layer_id
here. This code is primarily not blimp, so the engine reference here is kind of
obscure. 

[Khushal, 2016/10/08 00:41:33]

Not needed anymore. \o/

+                           ScrollbarOrientation orientation,
+                           int thumb_thickness,
+                           int track_start,
+                           bool is_left_side_vertical_scrollbar,
+                           int scroll_layer_id);
   ~SolidColorScrollbarLayer() override;
 
   // Layer overrides for proto conversions.
   void SetTypeForProtoSerialization(proto::LayerNode* proto) const override;
-  void LayerSpecificPropertiesToProto(proto::LayerProperties* proto,
-                                      bool inputs_only) override;
-  void FromLayerSpecificPropertiesProto(
-      const proto::LayerProperties& proto) override;
 
  private:
   friend class LayerSerializationTest;