Revert "Delete CC."

cc/debug/rendering_stats_instrumentation.h

Index: cc/debug/rendering_stats_instrumentation.h
diff --git a/cc/debug/rendering_stats_instrumentation.h b/cc/debug/rendering_stats_instrumentation.h
new file mode 100644
index 0000000000000000000000000000000000000000..6861202e384932e030c552daf1fd33d90d646e6f
--- /dev/null
+++ b/cc/debug/rendering_stats_instrumentation.h
@@ -0,0 +1,71 @@
+// Copyright 2013 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 CC_DEBUG_RENDERING_STATS_INSTRUMENTATION_H_
+#define CC_DEBUG_RENDERING_STATS_INSTRUMENTATION_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "base/synchronization/lock.h"
+#include "cc/debug/rendering_stats.h"
+
+namespace cc {
+
+// RenderingStatsInstrumentation is shared among threads and manages conditional
+// recording of rendering stats into a private RenderingStats instance.
+class RenderingStatsInstrumentation {
+ public:
+  static scoped_ptr<RenderingStatsInstrumentation> Create();
+  virtual ~RenderingStatsInstrumentation();
+
+  // Return copy of current impl thread rendering stats.
+  RenderingStats impl_thread_rendering_stats();
+
+  // Return the accumulated, combined rendering stats.
+  RenderingStats GetRenderingStats();
+
+  // Add current impl thread rendering stats to accumulator and
+  // clear current stats.
+  void AccumulateAndClearImplThreadStats();
+
+  // Read and write access to the record_rendering_stats_ flag is not locked to
+  // improve performance. The flag is commonly turned off and hardly changes
+  // it's value during runtime.
+  bool record_rendering_stats() const { return record_rendering_stats_; }
+  void set_record_rendering_stats(bool record_rendering_stats) {
+    if (record_rendering_stats_ != record_rendering_stats)
+      record_rendering_stats_ = record_rendering_stats;
+  }
+
+  base::TimeDelta StartRecording() const;
+  base::TimeDelta EndRecording(base::TimeDelta start_time) const;
+
+  void IncrementFrameCount(int64 count);
+  void AddVisibleContentArea(int64 area);
+  void AddApproximatedVisibleContentArea(int64 area);
+  void AddDrawDuration(base::TimeDelta draw_duration,
+                       base::TimeDelta draw_duration_estimate);
+  void AddBeginMainFrameToCommitDuration(
+      base::TimeDelta begin_main_frame_to_commit_duration,
+      base::TimeDelta begin_main_frame_to_commit_duration_estimate);
+  void AddCommitToActivateDuration(
+      base::TimeDelta commit_to_activate_duration,
+      base::TimeDelta commit_to_activate_duration_estimate);
+
+ protected:
+  RenderingStatsInstrumentation();
+
+ private:
+  RenderingStats impl_thread_rendering_stats_;
+  RenderingStats impl_thread_rendering_stats_accu_;
+
+  bool record_rendering_stats_;
+
+  base::Lock lock_;
+
+  DISALLOW_COPY_AND_ASSIGN(RenderingStatsInstrumentation);
+};
+
+}  // namespace cc
+
+#endif  // CC_DEBUG_RENDERING_STATS_INSTRUMENTATION_H_