Merge GrGLSLShaderVar and GrShaderVar

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=5087

Change-Id: Ib8943a1da1ea495554feaf5b0992b94fbb9539ab
Reviewed-on: https://skia-review.googlesource.com/5087
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
diff --git a/gn/gpu.gni b/gn/gpu.gni
index 84b3624..fca4939 100644
--- a/gn/gpu.gni
+++ b/gn/gpu.gni
@@ -185,6 +185,7 @@
   "$_src/gpu/GrTraceMarker.h",
   "$_src/gpu/GrTracing.h",
   "$_src/gpu/GrTestUtils.cpp",
+  "$_src/gpu/GrShaderVar.cpp",
   "$_src/gpu/GrSWMaskHelper.cpp",
   "$_src/gpu/GrSWMaskHelper.h",
   "$_src/gpu/GrSoftwarePathRenderer.cpp",
@@ -421,7 +422,6 @@
   "$_src/gpu/glsl/GrGLSLProgramDataManager.h",
   "$_src/gpu/glsl/GrGLSLShaderBuilder.cpp",
   "$_src/gpu/glsl/GrGLSLShaderBuilder.h",
-  "$_src/gpu/glsl/GrGLSLShaderVar.h",
   "$_src/gpu/glsl/GrGLSLUniformHandler.h",
   "$_src/gpu/glsl/GrGLSLUtil.cpp",
   "$_src/gpu/glsl/GrGLSLUtil.h",