Add force_compositing_mode support in gpu blacklist.

chrome/browser/ui/webui/gpu_internals_ui.cc

Index: chrome/browser/ui/webui/gpu_internals_ui.cc
===================================================================
--- chrome/browser/ui/webui/gpu_internals_ui.cc	(revision 176935)
+++ chrome/browser/ui/webui/gpu_internals_ui.cc	(working copy)
@@ -318,6 +318,15 @@
           "Panel fitting is unavailable, either disabled at the command"
           " line or not supported by the current system.",
           false
+      },
+      {
+          "force_compositing_mode",
+          flags & content::GPU_FEATURE_TYPE_FORCE_COMPOSITING_MODE,
+          !content::IsForceCompositingModeEnabled() &&
+          (flags & content::GPU_FEATURE_TYPE_FORCE_COMPOSITING_MODE) == 0,

[vangelis, 2013/01/16 08:00:06]

I'm not sure I understand this part here. What would the message be if FCM is
disabled via the blacklist?  What would it be if FCM is on? 

[Zhenyao Mo, 2013/01/16 15:34:55]

If FCM is disabled via a blacklist entry, that entry will have a message to
display in about:gpu, so the message below shouldn't be triggered.

+          "Force compositing mode is off, either disabled at the command"
+          " line or not supported by the current system.",
+          false
       }
   };
   const size_t kNumFeatures = sizeof(kGpuFeatureInfo) / sizeof(GpuFeatureInfo);