Implement native GMB backbuffers in the GLES2 Command Decoder.

gpu/command_buffer/service/context_group_unittest.cc

Index: gpu/command_buffer/service/context_group_unittest.cc
diff --git a/gpu/command_buffer/service/context_group_unittest.cc b/gpu/command_buffer/service/context_group_unittest.cc
index 96dc351e9355a54256a0da97970c1acccaa8e7c7..36934c73501a8cafc3cab56f8f1656cd316ecfc8 100644
--- a/gpu/command_buffer/service/context_group_unittest.cc
+++ b/gpu/command_buffer/service/context_group_unittest.cc
@@ -44,7 +44,7 @@ class ContextGroupTest : public GpuServiceTest {
     scoped_refptr<FeatureInfo> feature_info = new FeatureInfo;
     group_ = scoped_refptr<ContextGroup>(
         new ContextGroup(gpu_preferences_, NULL, NULL, NULL, NULL, feature_info,
-                         kBindGeneratesResource));
+                         kBindGeneratesResource, nullptr));
   }
 
   GpuPreferences gpu_preferences_;