Workaround for Intel 6xxx clear to 0/1 bug

ui/gl/gl_context.h

 // 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.
 
 #ifndef UI_GL_GL_CONTEXT_H_
 #define UI_GL_GL_CONTEXT_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/cancelable_callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/synchronization/cancellation_flag.h"
 #include "ui/gl/gl_export.h"
 #include "ui/gl/gl_share_group.h"
 #include "ui/gl/gl_state_restorer.h"
+#include "ui/gl/gl_workarounds.h"
 #include "ui/gl/gpu_preference.h"
 
 namespace gl {
 class YUVToRGBConverter;
 }  // namespace gl
 
 namespace gpu {
 class GLContextVirtual;
 }  // namespace gpu
 
@@ skipping 60 matching lines @@
   // Returns true if this context and surface is current. Pass a null surface
   // if the current surface is not important.
   virtual bool IsCurrent(GLSurface* surface) = 0;
 
   // Get the underlying platform specific GL context "handle".
   virtual void* GetHandle() = 0;
 
   // Creates a GPUTimingClient class which abstracts various GPU Timing exts.
   virtual scoped_refptr<GPUTimingClient> CreateGPUTimingClient() = 0;
 
+  // Set the GL workarounds.
+  void SetGLWorkarounds(const GLWorkarounds& workarounds);
+
   // Gets the GLStateRestorer for the context.
   GLStateRestorer* GetGLStateRestorer();
 
   // Sets the GLStateRestorer for the context (takes ownership).
   void SetGLStateRestorer(GLStateRestorer* state_restorer);
 
   // Set swap interval. This context must be current.
   void SetSwapInterval(int interval);
 
   // Forces the swap interval to zero (no vsync) regardless of any future values
@@ skipping 106 matching lines @@
   virtual void OnSetSwapInterval(int interval) = 0;
 
  private:
   friend class base::RefCounted<GLContext>;
 
   // For GetRealCurrent.
   friend class gpu::GLContextVirtual;
 
   std::unique_ptr<GLVersionInfo> GenerateGLVersionInfo();
 
+  GLWorkarounds gl_workarounds_;
+
   bool static_bindings_initialized_ = false;
   bool dynamic_bindings_initialized_ = false;
   std::unique_ptr<DriverGL> driver_gl_;
   std::unique_ptr<GLApi> gl_api_;
   std::unique_ptr<TraceGLApi> trace_gl_api_;
   std::unique_ptr<DebugGLApi> debug_gl_api_;
   std::unique_ptr<CurrentGL> current_gl_;
 
   // Copy of the real API (if one was created) for dynamic initialization
   RealGLApi* real_gl_api_ = nullptr;
@@ skipping 30 matching lines @@
 // scoped_refptr containing the initialized GLContext or nullptr if
 // initialization fails.
 GL_EXPORT scoped_refptr<GLContext> InitializeGLContext(
     scoped_refptr<GLContext> context,
     GLSurface* compatible_surface,
     const GLContextAttribs& attribs);
 
 }  // namespace gl
 
 #endif  // UI_GL_GL_CONTEXT_H_