Move GrGLSL.h from include/private to src/gpu/glsl.

Nothing public was including this and it was included unnecessarily in many places.

Change-Id: Iee960b3e67981ab41af7442cc43391f2f57eb551
Reviewed-on: https://skia-review.googlesource.com/135787
Commit-Queue: Brian Salomon <bsalomon@google.com>
Auto-Submit: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
diff --git a/gn/gpu.gni b/gn/gpu.gni
index bf448ce..ba45a9b 100644
--- a/gn/gpu.gni
+++ b/gn/gpu.gni
@@ -35,7 +35,6 @@
   "$_include/private/GrColor.h",
   "$_include/private/GrCCClipPath.h",
   "$_include/private/GrCCPerOpListPaths.h",
-  "$_include/private/GrGLSL.h",
   "$_include/private/GrOpList.h",
   "$_include/private/GrSingleOwner.h",
   "$_include/private/GrRenderTargetProxy.h",
@@ -483,6 +482,7 @@
 
   # GLSL
   "$_src/gpu/glsl/GrGLSL.cpp",
+  "$_src/gpu/glsl/GrGLSL.h",
   "$_src/gpu/glsl/GrGLSLBlend.cpp",
   "$_src/gpu/glsl/GrGLSLBlend.h",
   "$_src/gpu/glsl/GrGLSLColorSpaceXformHelper.h",