Workaround for Intel 6xxx clear to 0/1 bug

ui/gl/gl_context.h

Index: ui/gl/gl_context.h
diff --git a/ui/gl/gl_context.h b/ui/gl/gl_context.h
index 0d1aa6d0f40492d74e3f056cc3ffbd53e4a2ef74..ff9cfdbbb5d7536d04e7f8dc8b48ec3fd069ad7a 100644
--- a/ui/gl/gl_context.h
+++ b/ui/gl/gl_context.h
@@ -16,6 +16,7 @@
 #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 {
@@ -96,6 +97,9 @@ class GL_EXPORT GLContext : public base::RefCounted<GLContext> {
   // 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();
 
@@ -222,6 +226,8 @@ class GL_EXPORT GLContext : public base::RefCounted<GLContext> {
 
   std::unique_ptr<GLVersionInfo> GenerateGLVersionInfo();
 
+  GLWorkarounds gl_workarounds_;
+
   bool static_bindings_initialized_ = false;
   bool dynamic_bindings_initialized_ = false;
   std::unique_ptr<DriverGL> driver_gl_;