Workaround for Intel 6xxx clear to 0/1 bug

ui/gl/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/buildflag_header.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/linux/pkg_config.gni")
 import("//build/config/ui.gni")
 import("//ui/ozone/ozone.gni")
 import("//testing/test.gni")
@@ skipping 50 matching lines @@
     "gl_bindings_autogen_gl.cc",
     "gl_bindings_autogen_gl.h",
     "gl_bindings_autogen_osmesa.cc",
     "gl_bindings_autogen_osmesa.h",
     "gl_context.cc",
     "gl_context.h",
     "gl_context_osmesa.cc",
     "gl_context_osmesa.h",
     "gl_context_stub.cc",
     "gl_context_stub.h",
+    "gl_driver_workarounds.cc",
+    "gl_driver_workarounds.h",
     "gl_enums.cc",
     "gl_enums.h",
     "gl_enums_implementation_autogen.h",
     "gl_export.h",
     "gl_fence.cc",
     "gl_fence.h",
     "gl_fence_arb.cc",
     "gl_fence_arb.h",
     "gl_fence_nv.cc",
     "gl_fence_nv.h",
@@ skipping 368 matching lines @@
     sources = [
       "../android/java/src/org/chromium/ui/gl/SurfaceTextureListener.java",
       "../android/java/src/org/chromium/ui/gl/SurfaceTexturePlatformWrapper.java",
     ]
     public_deps = [
       ":surface_jni_headers",
     ]
     jni_package = "ui/gl"
   }
 }