Add a |scope| argument to TRACE_EVENT_INSTANT* and require its presence.

cc/tile_manager.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/tile_manager.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
@@ skipping 378 matching lines @@
     }
   }
   TRACE_COUNTER_ID1("cc", "LiveOrAllocatedTileCount", this,
                     live_or_allocated_tiles_.size());
 
   SortTiles();
 
   // Assign gpu memory and determine what tiles need to be rasterized.
   AssignGpuMemoryToTiles();
 
-  TRACE_EVENT_INSTANT1("cc", "DidManage", "state",
-                       ValueToString(BasicStateAsValue()));
+  TRACE_EVENT_INSTANT1("cc", "DidManage", TRACE_EVENT_SCOPE_THREAD,
+                       "state", ValueToString(BasicStateAsValue()));
 
   // Finally, kick the rasterizer.
   DispatchMoreTasks();
 }
 
 void TileManager::CheckForCompletedTileUploads() {
   while (!tiles_with_pending_set_pixels_.empty()) {
     Tile* tile = tiles_with_pending_set_pixels_.front();
     DCHECK(tile->managed_state().resource);
 
@@ skipping 584 matching lines @@
     decode_begin_time = base::TimeTicks::HighResNow();
   pixel_ref->Decode();
   if (stats) {
     stats->totalDeferredImageDecodeCount++;
     stats->totalDeferredImageDecodeTime +=
         base::TimeTicks::HighResNow() - decode_begin_time;
   }
 }
 
 }  // namespace cc