Mozart: Ensure time always runs forward.

mojo/services/gfx/composition/cpp/formatting.cc

 // Copyright 2015 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 "mojo/services/gfx/composition/cpp/formatting.h"
 
 #include <ostream>
 
 namespace mojo {
 namespace gfx {
@@ skipping 11 matching lines @@
     return os_;
   }
 
  private:
   std::ostream& os_;
   bool need_comma_ = false;
 };
 
 std::ostream& operator<<(std::ostream& os,
                          const mojo::gfx::composition::SceneToken& value) {
-  return os << "{value=" << value.value << "}";
+  return os << "<S" << value.value << ">";
 }
 
 std::ostream& operator<<(std::ostream& os,
                          const mojo::gfx::composition::SceneUpdate& value) {
   os << "{";
   Delimiter d(os);
   if (value.clear_resources) {
     d.Append() << "clear_resources=true";
   }
   if (value.clear_nodes) {
@@ skipping 197 matching lines @@
 
 std::ostream& operator<<(std::ostream& os,
                          const mojo::gfx::composition::NodeHit& value) {
   return os << "{node_id=" << value.node_id << ", transform=" << value.transform
             << "}";
 }
 
 }  // namespace composition
 }  // namespace gfx
 }  // namespace mojo