Add NV12 buffer scanout support from exo to ozone.

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 6e81ab67bb16f6c40c3775b676c2420785689b79..a76f88b89acfd3e55714088519754567e76300dd 100644
--- a/gpu/command_buffer/service/feature_info.cc
+++ b/gpu/command_buffer/service/feature_info.cc
@@ -1011,6 +1011,10 @@ void FeatureInfo::InitializeFeatures() {
     AddExtensionString("GL_CHROMIUM_ycbcr_420v_image");
     feature_flags_.chromium_image_ycbcr_420v = true;
   }
+
+#elif defined(OS_CHROMEOS) && defined(ARCH_CPU_ARM_FAMILY)
+  // TODO(dcastagna): Determine this feature at runtime querying minigbm.

[no sievers, 2016/08/30 20:12:04]

putting a bug number would be even better

[Daniele Castagna, 2016/09/12 22:14:58]

Done.

+  feature_flags_.chromium_image_ycbcr_420v = true;

[reveman, 2016/08/30 21:10:54]

drive-by: are we missing AddExtensionString("GL_CHROMIUM_ycbcr_420v_image")
here?

[Daniele Castagna, 2016/09/12 22:14:58]

Done.

 #endif
 
   if (extensions.Contains("GL_APPLE_ycbcr_422")) {