Add UI for output surface debugging.

tracing/tracing/ui/extras/chrome/cc/output_surface_view.css

Index: tracing/tracing/ui/extras/chrome/cc/output_surface_view.css
diff --git a/tracing/tracing/ui/extras/chrome/gpu/state_view.css b/tracing/tracing/ui/extras/chrome/cc/output_surface_view.css
similarity index 50%
copy from tracing/tracing/ui/extras/chrome/gpu/state_view.css
copy to tracing/tracing/ui/extras/chrome/cc/output_surface_view.css
index 466dbb5658583d6d0c1a0acd58e139912caadb2e..8fb0305e0812713022f73c8f498ff061b94b57cc 100644
--- a/tracing/tracing/ui/extras/chrome/gpu/state_view.css
+++ b/tracing/tracing/ui/extras/chrome/cc/output_surface_view.css
@@ -1,15 +1,14 @@
-/* Copyright (c) 2013 The Chromium Authors. All rights reserved.
+/* Copyright (c) 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.
  */
 
-.tr-ui-e-chrome-gpu-state-snapshot-view {
-  background: url('./images/checkerboard.png');
+.tr-ui-e-chrome-cc-output-surface-snapshot-view {
   display: -webkit-flex;
   overflow: auto;
 }
 
-.tr-ui-e-chrome-gpu-state-snapshot-view img {
+.tr-ui-e-chrome-cc-output-surface-snapshot-view img {
   display: block;
   margin: 16px auto 16px auto;
 }