Add CHROMIUM_ycbcr_422_image extension.

gpu/command_buffer/common/capabilities.cc

Index: gpu/command_buffer/common/capabilities.cc
diff --git a/gpu/command_buffer/common/capabilities.cc b/gpu/command_buffer/common/capabilities.cc
index d0ac492fde03b3b409d1861095bd3adcc3ef7fb7..e677b143324fbfff9c3cfeb674210b51c69d7143 100644
--- a/gpu/command_buffer/common/capabilities.cc
+++ b/gpu/command_buffer/common/capabilities.cc
@@ -73,11 +73,11 @@ Capabilities::Capabilities()
       blend_equation_advanced(false),
       blend_equation_advanced_coherent(false),
       texture_rg(false),
+      image_ycbcr_422(false),
       render_buffer_format_bgra8888(false),
       occlusion_query_boolean(false),
       surfaceless(false),
       major_version(2),
-      minor_version(0) {
-}
+      minor_version(0) {}
 
 }  // namespace gpu