gpu/config: Add workaround rewrite do-while on Mac < 10.11

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index 86074df50854075905257ab394e55fb06e0683f7..b9a3ac0af21f91f9abd65bca6ece5c285a5ee357 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -3727,6 +3727,8 @@ bool GLES2DecoderImpl::InitializeShaderTranslator() {
     driver_bug_workarounds |= SH_REWRITE_TEXELFETCHOFFSET_TO_TEXELFETCH;
   if (workarounds().add_and_true_to_loop_condition)
     driver_bug_workarounds |= SH_ADD_AND_TRUE_TO_LOOP_CONDITION;
+  if (workarounds().rewrite_do_while_loops)
+    driver_bug_workarounds |= SH_REWRITE_DO_WHILE_LOOPS;
 
   resources.WEBGL_debug_shader_precision =
       group_->gpu_preferences().emulate_shader_precision;