Support ozone=1 compositor_unittests with OSMesa

ui/gl/gl_image_ozone.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 "ui/gl/gl_image.h"
 
 #include "base/debug/trace_event.h"
 #include "ui/gl/gl_image_egl.h"
 #include "ui/gl/gl_image_stub.h"
 #include "ui/gl/gl_implementation.h"
 
 namespace gfx {
 
 scoped_refptr<GLImage> GLImage::CreateGLImage(gfx::PluginWindowHandle window) {
   TRACE_EVENT0("gpu", "GLImage::CreateGLImage");
   switch (GetGLImplementation()) {
+    case kGLImplementationOSMesaGL:
+      return NULL;
     case kGLImplementationEGLGLES2:
       return NULL;
     case kGLImplementationMockGL:
       return new GLImageStub;
     default:
       NOTREACHED();
       return NULL;
   }
 }
 
 scoped_refptr<GLImage> GLImage::CreateGLImageForGpuMemoryBuffer(
     gfx::GpuMemoryBufferHandle buffer, gfx::Size size) {
   TRACE_EVENT0("gpu", "GLImage::CreateGLImageForGpuMemoryBuffer");
   switch (GetGLImplementation()) {
+    case kGLImplementationOSMesaGL:
+      return NULL;
     case kGLImplementationEGLGLES2:
       return NULL;
     case kGLImplementationMockGL:
       return new GLImageStub;
     default:
       NOTREACHED();
       return NULL;
   }
 }
 
 }  // namespace gfx