Plumb thru that we cache the front buffer.

gpu/command_buffer/service/feature_info.cc

Index: gpu/command_buffer/service/feature_info.cc
diff --git a/gpu/command_buffer/service/feature_info.cc b/gpu/command_buffer/service/feature_info.cc
index 66c05a81801ca3b5316866c188f1fa7114f99d8d..ea74412662b3018292ddb9a4e5088ccef7de4855 100644
--- a/gpu/command_buffer/service/feature_info.cc
+++ b/gpu/command_buffer/service/feature_info.cc
@@ -393,6 +393,10 @@ void FeatureInfo::AddFeatures(const char* desired_features) {
   if (ext.HaveAndDesire("GL_CHROMIUM_post_sub_buffer")) {
     AddExtensionString("GL_CHROMIUM_post_sub_buffer");
   }
+
+  if (ext.HaveAndDesire("GL_CHROMIUM_front_buffer_cached")) {
+    AddExtensionString("GL_CHROMIUM_front_buffer_cached");
+  }
 }
 
 void FeatureInfo::AddExtensionString(const std::string& str) {