Allow each WGC3D subclass to determine the correct GrGLInterface for its GrContext.

ui/gfx/gl/gl_bindings_skia_in_process.cc

 // Copyright (c) 2011 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 "ui/gfx/gl/gl_bindings_skia_in_process.h"
 
 #include "base/logging.h"
 #include "ui/gfx/gl/gl_bindings.h"
 #include "ui/gfx/gl/gl_implementation.h"
@@ skipping 451 matching lines @@
 }
 
 GLvoid StubGLViewport(GLint x, GLint y, GLsizei width, GLsizei height) {
   glViewport(x, y, width, height);
 }
 }  // extern "C"
 }  // namespace
 
 namespace gfx {
 
-void BindSkiaToInProcessGL() {
+GrGLInterface* GetInProcessSkiaGLBinding() {
   static SkAutoTUnref<GrGLInterface> host_gl_interface;
   if (NULL == host_gl_interface.get()) {
     GrGLBinding binding;
     switch (gfx::GetGLImplementation()) {
       case gfx::kGLImplementationNone:
         NOTREACHED();
-        return;
+        return NULL;
       case gfx::kGLImplementationDesktopGL:
         binding = kDesktop_GrGLBinding;
         break;
       case gfx::kGLImplementationOSMesaGL:
         binding = kDesktop_GrGLBinding;
         break;
       case gfx::kGLImplementationEGLGLES2:
         binding = kES2_GrGLBinding;
         break;
       case gfx::kGLImplementationMockGL:
         NOTREACHED();
-        return;
+        return NULL;
       default:
         NOTREACHED();
-        return;
+        return NULL;
     }
 
     GrGLInterface* interface = new GrGLInterface;
     host_gl_interface.reset(interface);
 
     interface->fBindingsExported = binding;
     interface->fActiveTexture = StubGLActiveTexture;
     interface->fAttachShader = StubGLAttachShader;
     interface->fBindAttribLocation = StubGLBindAttribLocation;
     interface->fBindBuffer = StubGLBindBuffer;
@@ skipping 90 matching lines @@
     interface->fGetRenderbufferParameteriv = StubGLGetRenderbufferParameteriv;
     interface->fRenderbufferStorage = StubGLRenderbufferStorage;
     interface->fRenderbufferStorageMultisample =
       StubGLRenderbufferStorageMultisample;
     interface->fBlitFramebuffer = StubGLBlitFramebuffer;
     interface->fMapBuffer = StubGLMapBuffer;
     interface->fUnmapBuffer = StubGLUnmapBuffer;
     interface->fBindFragDataLocationIndexed =
       StubBindFragDataLocationIndexedARB;
   }
-  GrGLSetDefaultGLInterface(host_gl_interface.get());
+  return host_gl_interface.get();
 }
 
 }  // namespace gfx