Run the WebGL conformance tests with the passthrough command decoder.

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 82d788394e9a8cdeb9ad3a310e3ea8b937e08d9d..eea4e8cb1c7f91d04d225de5b66a120edf2738b7 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder_passthrough.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder_passthrough.cc
@@ -171,9 +171,9 @@ bool GLES2DecoderPassthroughImpl::Initialize(
 
   // Check for required extensions
   if (!feature_info_->feature_flags().angle_robust_client_memory ||
-      !feature_info_->feature_flags().chromium_bind_generates_resource ||
-      (feature_info_->IsWebGLContext() !=
-       feature_info_->feature_flags().angle_webgl_compatibility)) {
+      !feature_info_->feature_flags().chromium_bind_generates_resource) {
+    // TODO(geofflang): Verify that ANGLE_webgl_compatibility is enabled if this
+    // is a WebGL context (depends on crbug.com/671217).
     Destroy(true);
     return false;
   }