Teach GPU command buffer whether a context is webgl.

gpu/blink/webgraphicscontext3d_impl.cc

Index: gpu/blink/webgraphicscontext3d_impl.cc
diff --git a/gpu/blink/webgraphicscontext3d_impl.cc b/gpu/blink/webgraphicscontext3d_impl.cc
index f2e1434c32a2a6b8ac77ac17e9c5b9160485f15b..8645c2319c9ca29ec555f727a0851b36fe37e747 100644
--- a/gpu/blink/webgraphicscontext3d_impl.cc
+++ b/gpu/blink/webgraphicscontext3d_impl.cc
@@ -1230,8 +1230,7 @@ void WebGraphicsContext3DImpl::ConvertAttributes(
   output_attribs->fail_if_major_perf_caveat =
       attributes.failIfMajorPerformanceCaveat;
   output_attribs->bind_generates_resource = false;
-  output_attribs->es3_context_required =
-      (attributes.webGL && attributes.webGLVersion == 2);
+  output_attribs->webgl_version = attributes.webGLVersion;
 }
 
 }  // namespace gpu_blink