Revert "eliminated GrGLSLExpr"

This reverts commit 93f20f5629e52eed732d2b9d6dbbb351cc30b2cd.

Reason for revert: Mismerge readded deleted files.

Original change's description:
> eliminated GrGLSLExpr
> 
> Now that skslc performs all of the optimizations (and then some) that
> GrGLSLExpr is responsible for, it's just extra work for no benefit.
> 
> Bug: skia:
> Change-Id: I40b0629e00a33873ed9fc6c0a9f41d8350221f9a
> Reviewed-on: https://skia-review.googlesource.com/14560
> Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> 

TBR=bsalomon@google.com,ethannicholas@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: Ia8b723594527afe34489fc78a4b49039081b6390
Reviewed-on: https://skia-review.googlesource.com/15154
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/GLProgramsTest.cpp b/tests/GLProgramsTest.cpp
index 6e9bef9fc8..25cd3125b9 100644
--- a/tests/GLProgramsTest.cpp
+++ b/tests/GLProgramsTest.cpp
@@ -113,7 +113,7 @@ private:
     class GLFP : public GrGLSLFragmentProcessor {
     public:
         void emitCode(EmitArgs& args) override {
-            this->emitChild(0, args);
+            this->emitChild(0, nullptr, args);
         }
 
     private: