Support ozone=1 compositor_unittests with OSMesa

ui/gl/gl_context_ozone.cc

 // Copyright (c) 2013 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_context.h"
 
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/sys_info.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_context_egl.h"
+#include "ui/gl/gl_context_osmesa.h"
 #include "ui/gl/gl_context_stub.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_surface.h"
 
 namespace gfx {
 
 // static
 scoped_refptr<GLContext> GLContext::CreateGLContext(
     GLShareGroup* share_group,
     GLSurface* compatible_surface,
     GpuPreference gpu_preference) {
-  if (GetGLImplementation() == kGLImplementationMockGL)
-    return scoped_refptr<GLContext>(new GLContextStub());
 
-  scoped_refptr<GLContext> context;
-  if (!compatible_surface->GetHandle()) {
-    DLOG(ERROR) << "Surface has no associated handle.\n";
-    return NULL;
+  switch (GetGLImplementation()) {
+    case kGLImplementationMockGL:
+      return scoped_refptr<GLContext>(new GLContextStub());
+    case kGLImplementationOSMesaGL: {
+      scoped_refptr<GLContext> context(new GLContextOSMesa(share_group));
+      if (!context->Initialize(compatible_surface, gpu_preference))
+        return NULL;
+      return context;
+    }
+    case kGLImplementationEGLGLES2: {
+      scoped_refptr<GLContext> context(new GLContextEGL(share_group));
+      if (!context->Initialize(compatible_surface, gpu_preference))
+        return NULL;
+      return context;
+    }
+    default:
+      NOTREACHED();
+      return NULL;
   }
-
-  context = new GLContextEGL(share_group);
-
-  if (!context->Initialize(compatible_surface, gpu_preference))
-    return NULL;
-  return context;
 }
 
 }  // namespace gfx