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"
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/string_util.h"
 #include "base/threading/thread_local.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_gl_api_implementation.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_surface.h"
 #include "ui/gl/gl_switches.h"
 #include "ui/gl/gl_version_info.h"
 #include "ui/gl/gpu_timing.h"
 
 namespace gl {
 
 namespace {
+
 base::LazyInstance<base::ThreadLocalPointer<GLContext>>::Leaky
     current_context_ = LAZY_INSTANCE_INITIALIZER;
 
 base::LazyInstance<base::ThreadLocalPointer<GLContext>>::Leaky
     current_real_context_ = LAZY_INSTANCE_INITIALIZER;
+
+GLWorkarounds gl_workarounds;

[Zhenyao Mo, 2017/06/20 21:34:17]

Sorry. What I mean is the gl_workarounds should be a member of the GLContext
class.

[jiajia.qin, 2017/06/21 02:47:22]

Done.

+
 }  // namespace
 
+void SetGLWorkarounds(const GLWorkarounds& workarounds) {
+  gl_workarounds = workarounds;
+}
+
+GLWorkarounds GetGLWorkarounds() {
+  return gl_workarounds;
+}
+
 GLContext::ScopedReleaseCurrent::ScopedReleaseCurrent() : canceled_(false) {}
 
 GLContext::ScopedReleaseCurrent::~ScopedReleaseCurrent() {
   if (!canceled_ && GetCurrent()) {
     GetCurrent()->ReleaseCurrent(nullptr);
   }
 }
 
 void GLContext::ScopedReleaseCurrent::Cancel() {
   canceled_ = true;
@@ skipping 294 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