Allow creating GLImage-backed textures with glTexStorage2D.

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 8a114b4fe05ffa443364cd19e0957ca2d92673fc..d51144c32c68c784a30a0c69d0b39a10064faa97 100644
--- a/gpu/command_buffer/service/feature_info.cc
+++ b/gpu/command_buffer/service/feature_info.cc
@@ -436,6 +436,7 @@ void FeatureInfo::InitializeFeatures() {
   AddExtensionString("GL_CHROMIUM_texture_mailbox");
   AddExtensionString("GL_CHROMIUM_trace_marker");
   AddExtensionString("GL_EXT_debug_marker");
+  AddExtensionString("GL_CHROMIUM_texture_buffer");
 
   // Pre es3, there are no PBOS and all unpack state is handled in client side.
   // With es3, unpack state is needed in server side. We always mark these