Add force_compositing_mode support in gpu blacklist.

content/browser/gpu/compositor_util.cc

Index: content/browser/gpu/compositor_util.cc
===================================================================
--- content/browser/gpu/compositor_util.cc	(revision 176935)
+++ content/browser/gpu/compositor_util.cc	(working copy)
@@ -74,13 +74,18 @@
 
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
 
-  // Command line switches take precedence over field trials.
+  // Command line switches take precedence over blacklisting and field trials.
   if (command_line.HasSwitch(switches::kDisableForceCompositingMode))
     return false;
 
   if (command_line.HasSwitch(switches::kForceCompositingMode))
     return true;
 
+  GpuFeatureType blacklisted_features =
+    GpuDataManager::GetInstance()->GetBlacklistedFeatures();
+  if (blacklisted_features & GPU_FEATURE_TYPE_FORCE_COMPOSITING_MODE)
+    return false;
+
   base::FieldTrial* trial =
       base::FieldTrialList::Find(kGpuCompositingFieldTrialName);