move Sk{Test,Random}ScalerContext to tools

There's no need for Skia users to link this test code.

Change-Id: I9d6ef2a053d0cf5cb916aa254389ca819c48bae1
Reviewed-on: https://skia-review.googlesource.com/69922
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
diff --git a/tests/TextBlobCacheTest.cpp b/tests/TextBlobCacheTest.cpp
index 995328d..bd74301 100644
--- a/tests/TextBlobCacheTest.cpp
+++ b/tests/TextBlobCacheTest.cpp
@@ -8,14 +8,14 @@
 #include "sk_tool_utils.h"
 
 #include "SkCanvas.h"
-#include "SkPaint.h"
-#include "SkPoint.h"
-#include "SkTextBlob.h"
 #include "SkFontMgr.h"
 #include "SkGraphics.h"
+#include "SkPaint.h"
+#include "SkPoint.h"
+#include "SkRandomScalerContext.h"
 #include "SkSurface.h"
+#include "SkTextBlob.h"
 #include "SkTypeface.h"
-#include "../src/fonts/SkRandomScalerContext.h"
 
 #ifdef SK_BUILD_FOR_WIN
     #include "SkTypeface_win.h"