Collect shader outputs and interface block information.

This paves the way for returning ES3-specific info from the shader
translator with the new query methods.

BUG=angle:466

Change-Id: Ib13cdb604854cdf11e9dc00dd94f18eadc946561
Reviewed-on: https://chromium-review.googlesource.com/206770
Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
diff --git a/src/compiler/translator/util.h b/src/compiler/translator/util.h
index 7eac07b..b9f02f8 100644
--- a/src/compiler/translator/util.h
+++ b/src/compiler/translator/util.h
@@ -32,6 +32,7 @@
 bool IsVaryingOut(TQualifier qualifier);
 bool IsVarying(TQualifier qualifier);
 InterpolationType GetInterpolationType(TQualifier qualifier);
+BlockLayoutType GetBlockLayoutType(TLayoutBlockStorage blockStorage);
 TString ArrayString(const TType &type);
 
 template <typename VarT>