Revert "Remove invariant qualifier for input in fragment shader"

This reverts commit d842a6b2014447db0676c8a3f5a5e9ae4ce67d9a.

Because of WebglConformance_conformance_glsl_bugs_invariant_does_not_leak_across_shaders failure

BUG=chromium:659326

Change-Id: I0602e24f3d34ccf852cda865f673c5c7634f82a6
Reviewed-on: https://chromium-review.googlesource.com/403230
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
diff --git a/src/compiler/translator/OutputGLSLBase.cpp b/src/compiler/translator/OutputGLSLBase.cpp
index a041cfa..2be8e7e 100644
--- a/src/compiler/translator/OutputGLSLBase.cpp
+++ b/src/compiler/translator/OutputGLSLBase.cpp
@@ -146,9 +146,8 @@
 
 void TOutputGLSLBase::writeVariableType(const TType &type)
 {
-    TQualifier qualifier = type.getQualifier();
     TInfoSinkBase &out = objSink();
-    if (type.isInvariant() && qualifier != EvqFragmentIn && !IsGLSL420OrNewer(mOutput))
+    if (type.isInvariant())
     {
         out << "invariant ";
     }
@@ -157,6 +156,7 @@
         TInterfaceBlock *interfaceBlock = type.getInterfaceBlock();
         declareInterfaceBlockLayout(interfaceBlock);
     }
+    TQualifier qualifier = type.getQualifier();
     if (qualifier != EvqTemporary && qualifier != EvqGlobal)
     {
         if (IsGLSL130OrNewer(mOutput))