Move SkTSearch.h into src.

No public headers are using it anymore, so move it from include/private
into src/core where SkTSearch.cpp resides.

Change-Id: I4499c629487ff1b8c391b44708616d67567a3e9b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/213674
Commit-Queue: Ben Wagner <bungeman@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
diff --git a/src/gpu/gl/GrGLGpuProgramCache.cpp b/src/gpu/gl/GrGLGpuProgramCache.cpp
index e2a68e1..7523292 100644
--- a/src/gpu/gl/GrGLGpuProgramCache.cpp
+++ b/src/gpu/gl/GrGLGpuProgramCache.cpp
@@ -7,7 +7,7 @@
 
 #include "src/gpu/gl/GrGLGpu.h"
 
-#include "include/private/SkTSearch.h"
+#include "src/core/SkTSearch.h"
 #include "src/gpu/GrProcessor.h"
 #include "src/gpu/GrProgramDesc.h"
 #include "src/gpu/gl/GrGLPathRendering.h"