Mozart: Improve tracing and backpressure.

services/gfx/compositor/graph/scene_content.h

 // Copyright 2016 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.
 
 #ifndef SERVICES_GFX_COMPOSITOR_GRAPH_SCENE_CONTENT_H_
 #define SERVICES_GFX_COMPOSITOR_GRAPH_SCENE_CONTENT_H_
 
 #include <iosfwd>
 #include <string>
 #include <unordered_map>
@@ skipping 41 matching lines @@
 
   // Gets the version of the scene represented by this object.
   uint32_t version() const { return version_; }
 
   // Gets the time when this scene was presented.
   int64_t presentation_time() const { return presentation_time_; }
 
   // Returns true if this content satisfies a request for the specified version.
   bool MatchesVersion(uint32_t requested_version) const;
 
-  // Called to record drawing commands from a snapshot.
-  void RecordPicture(const Snapshot* snapshot, SkCanvas* canvas) const;
+  // Paints the content of the scene to a recording canvas.
+  void Paint(const Snapshot* snapshot, SkCanvas* canvas) const;
 
   // Performs a hit test at the specified point.
   // The |scene_point| is the hit tested point in the scene's coordinate space.
   // The |global_to_scene_transform| is the accumulated transform from the
   // global coordinate space to the scene's coordinate space.
   // Provides hit information for the scene in |out_scene_hit| if any.
   // Returns true if the search was terminated by an opaque hit.
   bool HitTest(const Snapshot* snapshot,
                const SkPoint& scene_point,
                const SkMatrix44& global_to_scene_transform,
@@ skipping 67 matching lines @@
 
   scoped_refptr<SceneContent> content_;
   std::ostream& err_;
 
   DISALLOW_COPY_AND_ASSIGN(SceneContentBuilder);
 };
 
 }  // namespace compositor
 
 #endif  // SERVICES_GFX_COMPOSITOR_GRAPH_SCENE_CONTENT_H_