Enable ANGLE workaround for Intel MacOS abs bug

gpu/command_buffer/service/gles2_cmd_decoder.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 "gpu/command_buffer/service/gles2_cmd_decoder.h"
 
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
@@ skipping 3708 matching lines @@
   if (workarounds().init_gl_position_in_vertex_shader)
     driver_bug_workarounds |= SH_INIT_GL_POSITION;
   if (workarounds().unfold_short_circuit_as_ternary_operation)
     driver_bug_workarounds |= SH_UNFOLD_SHORT_CIRCUIT;
   if (workarounds().scalarize_vec_and_mat_constructor_args)
     driver_bug_workarounds |= SH_SCALARIZE_VEC_AND_MAT_CONSTRUCTOR_ARGS;
   if (workarounds().regenerate_struct_names)
     driver_bug_workarounds |= SH_REGENERATE_STRUCT_NAMES;
   if (workarounds().remove_pow_with_constant_exponent)
     driver_bug_workarounds |= SH_REMOVE_POW_WITH_CONSTANT_EXPONENT;
+  if (workarounds().emulate_abs_int_function)
+    driver_bug_workarounds |= SH_EMULATE_ABS_INT_FUNCTION;

[Jamie Madill, 2016/09/02 14:19:25]

not sure how this compiled, but it's breaking the ANGLE trybots because the
ANGLE-side CL hasn't landed.

 
   resources.WEBGL_debug_shader_precision =
       group_->gpu_preferences().emulate_shader_precision;
 
   ShShaderOutput shader_output_language =
       ShaderTranslator::GetShaderOutputLanguageForContext(gl_version_info());
 
   vertex_translator_ = shader_translator_cache()->GetTranslator(
       GL_VERTEX_SHADER, shader_spec, &resources, shader_output_language,
       static_cast<ShCompileOptions>(driver_bug_workarounds));
@@ skipping 14007 matching lines @@
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "base/macros.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu