Add UI for output surface debugging.

tracing/trace_viewer.gypi

Index: tracing/trace_viewer.gypi
diff --git a/tracing/trace_viewer.gypi b/tracing/trace_viewer.gypi
index 70c89580511bad8b6f44a0d0a4981fb6b7987a23..18baaded15ba34e58e57f4713318b71fa7cc2444 100644
--- a/tracing/trace_viewer.gypi
+++ b/tracing/trace_viewer.gypi
@@ -13,6 +13,7 @@
       'tracing/ui/extras/chrome/cc/layer_picker.css',
       'tracing/ui/extras/chrome/cc/layer_tree_host_impl_view.css',
       'tracing/ui/extras/chrome/cc/layer_view.css',
+      'tracing/ui/extras/chrome/cc/output_surface_view.css',
       'tracing/ui/extras/chrome/cc/picture_ops_chart_summary_view.css',
       'tracing/ui/extras/chrome/cc/picture_ops_chart_view.css',
       'tracing/ui/extras/chrome/cc/picture_ops_list_view.css',
@@ -84,6 +85,7 @@
       'tracing/extras/chrome/cc/layer_impl.html',
       'tracing/extras/chrome/cc/layer_tree_host_impl.html',
       'tracing/extras/chrome/cc/layer_tree_impl.html',
+      'tracing/extras/chrome/cc/output_surface.html',
       'tracing/extras/chrome/cc/picture.html',
       'tracing/extras/chrome/cc/picture_as_image_data.html',
       'tracing/extras/chrome/cc/raster_task.html',
@@ -404,6 +406,7 @@
       'tracing/ui/extras/chrome/cc/layer_tree_host_impl_view.html',
       'tracing/ui/extras/chrome/cc/layer_tree_quad_stack_view.html',
       'tracing/ui/extras/chrome/cc/layer_view.html',
+      'tracing/ui/extras/chrome/cc/output_surface_view.html',
       'tracing/ui/extras/chrome/cc/picture_debugger.html',
       'tracing/ui/extras/chrome/cc/picture_ops_chart_summary_view.html',
       'tracing/ui/extras/chrome/cc/picture_ops_chart_view.html',