Hook up the ANGLE extensions for disabling client-side data.

gpu/command_buffer/service/gles2_cmd_decoder_passthrough.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder_passthrough.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder_passthrough.cc b/gpu/command_buffer/service/gles2_cmd_decoder_passthrough.cc
index 01838e344cd84d1e8614c535d3511ce4c2460799..efe4c77cb7efc69d223925eab1764389dd43ed1e 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder_passthrough.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder_passthrough.cc
@@ -176,7 +176,9 @@ bool GLES2DecoderPassthroughImpl::Initialize(
   if (!feature_info_->feature_flags().angle_robust_client_memory ||
       !feature_info_->feature_flags().chromium_bind_generates_resource ||
       !feature_info_->feature_flags().chromium_copy_texture ||
-      !feature_info_->feature_flags().chromium_copy_compressed_texture) {
+      !feature_info_->feature_flags().chromium_copy_compressed_texture ||
+      !feature_info_->feature_flags().angle_client_arrays ||
+      glIsEnabled(GL_CLIENT_ARRAYS_ANGLE) != GL_FALSE) {

[Zhenyao Mo, 2017/02/16 21:59:45]

So context creation should only continue if ANGLE_client_arrays exists but not
enabled?

[Geoff Lang, 2017/02/16 22:08:26]

It continues only if the extension exists and the client arrays feature has been
disabled.

     // TODO(geofflang): Verify that ANGLE_webgl_compatibility is enabled if this
     // is a WebGL context (depends on crbug.com/671217).
     Destroy(true);