Workaround for Intel 6xxx clear to 0/1 bug

ui/gl/gl_context.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_context.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/cancelable_callback.h"
@@ skipping 26 matching lines @@
 GLContext::ScopedReleaseCurrent::~ScopedReleaseCurrent() {
   if (!canceled_ && GetCurrent()) {
     GetCurrent()->ReleaseCurrent(nullptr);
   }
 }
 
 void GLContext::ScopedReleaseCurrent::Cancel() {
   canceled_ = true;
 }
 
+GLWorkarounds GLContext::gl_workarounds_;
+
+// static
+void GLContext::SetGLWorkarounds(const GLWorkarounds& workarounds) {
+  gl_workarounds_ = workarounds;
+}
+
+// static
+GLWorkarounds GLContext::GetGLWorkarounds() {
+  return gl_workarounds_;
+}
+
 GLContext::GLContext(GLShareGroup* share_group) : share_group_(share_group) {
   if (!share_group_.get())
     share_group_ = new gl::GLShareGroup();
   share_group_->AddContext(this);
 }
 
 GLContext::~GLContext() {
   share_group_->RemoveContext(this);
   if (GetCurrent() == this) {
     SetCurrent(nullptr);
@@ skipping 282 matching lines @@
 
 scoped_refptr<GLContext> InitializeGLContext(scoped_refptr<GLContext> context,
                                              GLSurface* compatible_surface,
                                              const GLContextAttribs& attribs) {
   if (!context->Initialize(compatible_surface, attribs))
     return nullptr;
   return context;
 }
 
 }  // namespace gl