Due to Adreno bug in compiling struct function parameter in shader.

BUG=angleproject:1427
TEST=SamplerInStructAsFunctionParameterTest
     SamplerInStructArrayAsFunctionParameterTest
     SamplerInNestedStructAsFunctionParameterTest

Change-Id: I979312885f2047e78b61530c97703854a4be1586
Reviewed-on: https://chromium-review.googlesource.com/356125Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>