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

ui/gl/test/gl_surface_test_support.cc

Index: ui/gl/test/gl_surface_test_support.cc
diff --git a/ui/gl/test/gl_surface_test_support.cc b/ui/gl/test/gl_surface_test_support.cc
index d7f132316f4e42f3f41ab73a1eb916fa420b5a26..88f4fed000a2557f25ee5b5dac7057003ef14eab 100644
--- a/ui/gl/test/gl_surface_test_support.cc
+++ b/ui/gl/test/gl_surface_test_support.cc
@@ -94,4 +94,12 @@ void GLSurfaceTestSupport::InitializeOneOffWithMockBindings() {
   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