Workaround for Intel 6xxx clear to 0/1 bug

ui/gl/gl_driver_workarounds.h

Index: ui/gl/gl_driver_workarounds.h
diff --git a/ui/gl/gl_driver_workarounds.h b/ui/gl/gl_driver_workarounds.h
new file mode 100644
index 0000000000000000000000000000000000000000..776a93e1be475bea512ff81d21107032048f9483
--- /dev/null
+++ b/ui/gl/gl_driver_workarounds.h
@@ -0,0 +1,20 @@
+// Copyright 2017 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.
+
+#ifndef UI_GL_GL_DRIVER_WORKAROUNDS_H_
+#define UI_GL_GL_DRIVER_WORKAROUNDS_H_
+
+#include "ui/gl/gl_export.h"
+
+namespace gl {
+namespace workarounds {
+
+// glClearColor does not always work on Intel 6xxx Mac drivers. See
+// crbug.com/710443.
+GL_EXPORT extern bool clearToBoundaryValuesIsBroken;

[Zhenyao Mo, 2017/06/19 21:47:20]

wrong naming convention

[Zhenyao Mo, 2017/06/19 21:47:20]

I really think we should avoid global variables.

I suggest you make this a struct and make it part of either gl_context or
gl_share_group.

[jiajia.qin, 2017/06/20 04:22:45]

Done.

+
+}  // namespace workarounds
+}  // namespace gl
+
+#endif  // UI_GL_GL_DRIVER_WORKAROUNDS_H_