tracing: Make ConvertableToTraceFormat move-only scoped_ptr

cc/layers/layer_impl.h

Index: cc/layers/layer_impl.h
diff --git a/cc/layers/layer_impl.h b/cc/layers/layer_impl.h
index b5f2ee25183d93fee72f2c4b3e77dbaf73c61df4..1b7519a72b1bd8f9e0493cd0cb5ef37726083cc2 100644
--- a/cc/layers/layer_impl.h
+++ b/cc/layers/layer_impl.h
@@ -47,7 +47,6 @@
 
 namespace base {
 namespace trace_event {
-class ConvertableToTraceFormat;
 class TracedValue;
 }
 class DictionaryValue;
@@ -55,6 +54,7 @@ class DictionaryValue;
 
 namespace cc {
 
+class LayerDebugInfo;
 class LayerTreeHostImpl;
 class LayerTreeImpl;
 class MicroBenchmarkImpl;
@@ -619,8 +619,7 @@ class CC_EXPORT LayerImpl : public LayerAnimationValueObserver,
 
   virtual void RunMicroBenchmark(MicroBenchmarkImpl* benchmark);
 
-  virtual void SetDebugInfo(
-      scoped_refptr<base::trace_event::ConvertableToTraceFormat> other);
+  void SetDebugInfo(scoped_refptr<LayerDebugInfo> debug_info);
 
   bool IsDrawnRenderSurfaceLayerListMember() const;
 
@@ -861,7 +860,7 @@ class CC_EXPORT LayerImpl : public LayerAnimationValueObserver,
   DrawProperties draw_properties_;
   PerformanceProperties<LayerImpl> performance_properties_;
 
-  scoped_refptr<base::trace_event::ConvertableToTraceFormat> debug_info_;
+  scoped_refptr<LayerDebugInfo> debug_info_;
   scoped_ptr<RenderSurfaceImpl> render_surface_;
 
   bool force_render_surface_;