Refactor GL bindings so there is no global GLApi or DriverGL.

ui/gl/test/gl_surface_test_support.cc

 // Copyright 2015 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/test/gl_surface_test_support.h"
 
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 76 matching lines @@
 
 // static
 void GLSurfaceTestSupport::InitializeOneOffWithMockBindings() {
 #if defined(USE_OZONE)
   // This function skips where Ozone is otherwise initialized.
   ui::OzonePlatform::InitializeForGPU();
 #endif
   InitializeOneOffImplementation(kGLImplementationMockGL, false);
 }
 
+void GLSurfaceTestSupport::InitializeOneOffWithStubBindings() {
+#if defined(USE_OZONE)
+  // This function skips where Ozone is otherwise initialized.
+  ui::OzonePlatform::InitializeForGPU();
+#endif
+  InitializeOneOffImplementation(kGLImplementationStubGL, false);
+}
+
 }  // namespace gl