tracing: Make ConvertableToTraceFormat move-only scoped_ptr

cc/debug/frame_viewer_instrumentation.cc

 // Copyright 2014 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/debug/frame_viewer_instrumentation.h"
 
 #include "cc/debug/traced_value.h"
 
 namespace cc {
 namespace frame_viewer_instrumentation {
 
 const char kCategoryLayerTree[] =
     TRACE_DISABLED_BY_DEFAULT("cc.debug") ","
     TRACE_DISABLED_BY_DEFAULT("cc.debug.quads") ","
     TRACE_DISABLED_BY_DEFAULT("devtools.timeline.layers");
 
 namespace {
 
 const char kCategory[] = "cc," TRACE_DISABLED_BY_DEFAULT("devtools.timeline");
 const char kTileData[] = "tileData";
 const char kLayerId[] = "layerId";
 const char kTileId[] = "tileId";
 const char kTileResolution[] = "tileResolution";
 const char kSourceFrameNumber[] = "sourceFrameNumber";
 
 const char kAnalyzeTask[] = "AnalyzeTask";
 const char kRasterTask[] = "RasterTask";
 
-scoped_refptr<base::trace_event::ConvertableToTraceFormat> TileDataAsValue(
+scoped_ptr<base::trace_event::ConvertableToTraceFormat> TileDataAsValue(
     const void* tile_id,
     TileResolution tile_resolution,
     int source_frame_number,
     int layer_id) {
-  scoped_refptr<base::trace_event::TracedValue> res(
+  scoped_ptr<base::trace_event::TracedValue> res(
       new base::trace_event::TracedValue());
   TracedValue::SetIDRef(tile_id, res.get(), kTileId);
   res->SetString(kTileResolution, TileResolutionToString(tile_resolution));
   res->SetInteger(kSourceFrameNumber, source_frame_number);
   res->SetInteger(kLayerId, layer_id);
-  return res;
+  return std::move(res);
 }
 
 }  // namespace
 
 ScopedAnalyzeTask::ScopedAnalyzeTask(const void* tile_id,
                                      TileResolution tile_resolution,
                                      int source_frame_number,
                                      int layer_id) {
   TRACE_EVENT_BEGIN1(
       kCategory, kAnalyzeTask, kTileData,
@@ skipping 18 matching lines @@
 }
 
 bool IsTracingLayerTreeSnapshots() {
   bool category_enabled;
   TRACE_EVENT_CATEGORY_GROUP_ENABLED(kCategoryLayerTree, &category_enabled);
   return category_enabled;
 }
 
 }  // namespace frame_viewer_instrumentation
 }  // namespace cc