command_buffer: Add support for creating non-WebGL ES 3 contexts

gpu/blink/webgraphicscontext3d_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/blink/webgraphicscontext3d_impl.h"
 
 #include "base/atomicops.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "gpu/GLES2/gl2extchromium.h"
@@ skipping 1236 matching lines @@
     const blink::WebGraphicsContext3D::Attributes& attributes,
     ::gpu::gles2::ContextCreationAttribHelper* output_attribs) {
   output_attribs->alpha_size = attributes.alpha ? 8 : 0;
   output_attribs->depth_size = attributes.depth ? 24 : 0;
   output_attribs->stencil_size = attributes.stencil ? 8 : 0;
   output_attribs->samples = attributes.antialias ? 4 : 0;
   output_attribs->sample_buffers = attributes.antialias ? 1 : 0;
   output_attribs->fail_if_major_perf_caveat =
       attributes.failIfMajorPerformanceCaveat;
   output_attribs->bind_generates_resource = false;
-  output_attribs->webgl_version = attributes.webGLVersion;
+  switch (attributes.webGLVersion) {
+    case 0:
+      output_attribs->context_type = ::gpu::gles2::CONTEXT_TYPE_OPENGLES2;
+      break;
+    case 1:
+      output_attribs->context_type = ::gpu::gles2::CONTEXT_TYPE_WEBGL1;
+      break;
+    case 2:
+      output_attribs->context_type = ::gpu::gles2::CONTEXT_TYPE_WEBGL2;
+      break;
+    default:
+      NOTREACHED();
+      output_attribs->context_type = ::gpu::gles2::CONTEXT_TYPE_OPENGLES2;
+      break;
+  }
 }
 
 }  // namespace gpu_blink