Hook up REWRITE_FLOAT_UNARY_MINUS_OPERATOR workaround in ANGLE

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 1746557bcf2d810ea882561212635185b8ae925d..0c52d12f9edacb079d9720f4c1d062a1b23cfdcf 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -3834,6 +3834,8 @@ bool GLES2DecoderImpl::InitializeShaderTranslator() {
     driver_bug_workarounds |= SH_DONT_REMOVE_INVARIANT_FOR_FRAGMENT_INPUT;
   if (workarounds().remove_invariant_and_centroid_for_essl3)
     driver_bug_workarounds |= SH_REMOVE_INVARIANT_AND_CENTROID_FOR_ESSL3;
+  if (workarounds().rewrite_float_unary_minus_operator)
+    driver_bug_workarounds |= SH_REWRITE_FLOAT_UNARY_MINUS_OPERATOR;
 
   resources.WEBGL_debug_shader_precision =
       group_->gpu_preferences().emulate_shader_precision;