Workaround for Intel 6xxx clear to 0/1 bug

gpu/command_buffer/service/gles2_cmd_decoder_autogen.h

 // 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.
 
 // This file is auto-generated from
 // gpu/command_buffer/build_gles2_cmd_buffer.py
 // It's formatted by clang-format using chromium coding style:
 //    clang-format -i -style=chromium filename
 // DO NOT EDIT!
 
@@ skipping 462 matching lines @@
   GLclampf red = static_cast<GLclampf>(c.red);
   GLclampf green = static_cast<GLclampf>(c.green);
   GLclampf blue = static_cast<GLclampf>(c.blue);
   GLclampf alpha = static_cast<GLclampf>(c.alpha);
   if (state_.color_clear_red != red || state_.color_clear_green != green ||
       state_.color_clear_blue != blue || state_.color_clear_alpha != alpha) {
     state_.color_clear_red = red;
     state_.color_clear_green = green;
     state_.color_clear_blue = blue;
     state_.color_clear_alpha = alpha;
-    glClearColor(red, green, blue, alpha);
+    DoClearColor(red, green, blue, alpha);
   }
   return error::kNoError;
 }
 
 error::Error GLES2DecoderImpl::HandleClearDepthf(
     uint32_t immediate_data_size,
     const volatile void* cmd_data) {
   const volatile gles2::cmds::ClearDepthf& c =
       *static_cast<const volatile gles2::cmds::ClearDepthf*>(cmd_data);
   GLclampf depth = static_cast<GLclampf>(c.depth);
@@ skipping 4818 matching lines @@
         state_.enable_flags.cached_sample_alpha_to_one_ext = enabled;
         return true;
       }
       return false;
     default:
       NOTREACHED();
       return false;
   }
 }
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_AUTOGEN_H_