tracing: Make ConvertableToTraceFormat move-only scoped_ptr

cc/layers/layer_impl.cc

 // Copyright 2012 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/layers/layer_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <utility>
 
 #include "base/json/json_reader.h"
 #include "base/numerics/safe_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "cc/animation/animation_registrar.h"
 #include "cc/animation/mutable_properties.h"
 #include "cc/base/math_util.h"
 #include "cc/base/simple_enclosed_region.h"
 #include "cc/debug/debug_colors.h"
+#include "cc/debug/layer_debug_info.h"
 #include "cc/debug/layer_tree_debug_state.h"
 #include "cc/debug/micro_benchmark_impl.h"
 #include "cc/debug/traced_value.h"
 #include "cc/input/main_thread_scrolling_reason.h"
 #include "cc/input/scroll_state.h"
 #include "cc/layers/layer.h"
 #include "cc/layers/layer_utils.h"
 #include "cc/output/copy_output_request.h"
 #include "cc/quads/debug_border_draw_quad.h"
 #include "cc/quads/render_pass.h"
@@ skipping 163 matching lines @@
   if (scroll_parent_ == parent)
     return;
 
   if (parent)
     DCHECK_EQ(layer_tree_impl()->LayerById(parent->id()), parent);
 
   scroll_parent_ = parent;
   SetNeedsPushProperties();
 }
 
-void LayerImpl::SetDebugInfo(
-    scoped_refptr<base::trace_event::ConvertableToTraceFormat> other) {
-  debug_info_ = other;
+void LayerImpl::SetDebugInfo(scoped_refptr<LayerDebugInfo> debug_info) {
+  debug_info_ = debug_info;

[danakj, 2016/02/26 22:59:38]

you should move() here, don't need to hold a reference in this local var.

   SetNeedsPushProperties();
 }
 
 void LayerImpl::SetScrollChildren(std::set<LayerImpl*>* children) {
   if (scroll_children_.get() == children)
     return;
   scroll_children_.reset(children);
   SetNeedsPushProperties();
 }
 
@@ skipping 1560 matching lines @@
            .layer_transforms_should_scale_layer_contents) {
     return default_scale;
   }
 
   gfx::Vector2dF transform_scales = MathUtil::ComputeTransform2dScaleComponents(
       DrawTransform(), default_scale);
   return std::max(transform_scales.x(), transform_scales.y());
 }
 
 }  // namespace cc