Layout test for validating GLinfo on webglcontextcreationerror.

public/platform/WebGraphicsContext3D.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 46 matching lines @@
 typedef signed long int WGC3Dintptr;
 typedef signed long int WGC3Dsizeiptr;
 
 // Typedef for server-side objects like OpenGL textures and program objects.
 typedef WGC3Duint WebGLId;
 
 struct WebGLInfo {
     WebString vendorInfo;
     WebString rendererInfo;
     WebString driverVersion;
+    WebString contextInfoCollectionFailure;

[Ken Russell (switch to Gerrit), 2014/12/23 02:56:47]

I think you'll need to land the addition of this WebString first, then wait for
Blink to roll, then land the Chromium CL which will populate it, and then land
the rest of this CL adding the new test.

 };
 
 // This interface abstracts the operations performed by the
 // GraphicsContext3D in order to implement WebGL. Nearly all of the
 // methods exposed on this interface map directly to entry points in
 // the OpenGL ES 2.0 API.
 class WebGraphicsContext3D : public WebNonCopyable {
 public:
     // Return value from getActiveUniform and getActiveAttrib.
     struct ActiveInfo {
@@ skipping 391 matching lines @@
     virtual void vertexAttribDivisorANGLE(WGC3Duint index, WGC3Duint divisor) { }
 
     // GL_EXT_multisampled_render_to_texture
     virtual void framebufferTexture2DMultisampleEXT(WGC3Denum target, WGC3Denum attachment, WGC3Denum textarget, WebGLId texture, WGC3Dint level, WGC3Dsizei samples) { }
     virtual void renderbufferStorageMultisampleEXT(WGC3Denum target, WGC3Dsizei samples, WGC3Denum internalformat, WGC3Dsizei width, WGC3Dsizei height) { };
 };
 
 } // namespace blink
 
 #endif