Include the SkTSort header only where it is used.

Change-Id: If51be35205b40c4a22979a4b49b031126af1dde7
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/302500
Commit-Queue: John Stiles <johnstiles@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
diff --git a/src/pathops/SkPathOpsTSect.cpp b/src/pathops/SkPathOpsTSect.cpp
index 674c635..3d48c80 100644
--- a/src/pathops/SkPathOpsTSect.cpp
+++ b/src/pathops/SkPathOpsTSect.cpp
@@ -5,6 +5,7 @@
  * found in the LICENSE file.
  */
 
+#include "src/core/SkTSort.h"
 #include "src/pathops/SkPathOpsTSect.h"
 
 #define COINCIDENT_SPAN_COUNT 9