Revert "Delete CC."

cc/output/compositor_frame_ack.cc

Index: cc/output/compositor_frame_ack.cc
diff --git a/cc/output/compositor_frame_ack.cc b/cc/output/compositor_frame_ack.cc
new file mode 100644
index 0000000000000000000000000000000000000000..feb0bac36741441b6c3dc41f4eb2987e8ad151d5
--- /dev/null
+++ b/cc/output/compositor_frame_ack.cc
@@ -0,0 +1,14 @@
+// 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/output/compositor_frame_ack.h"
+
+namespace cc {
+
+CompositorFrameAck::CompositorFrameAck()
+    : last_software_frame_id(0) {}
+
+CompositorFrameAck::~CompositorFrameAck() {}
+
+}  // namespace cc