pathops: Add missing header guards in two files.

src/pathops/SkPathOpsTSect.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
+#ifndef SkPathOpsTSect_DEFINED
+#define SkPathOpsTSect_DEFINED
 
 #include "SkChunkAlloc.h"
 #include "SkPathOpsBounds.h"
 #include "SkPathOpsRect.h"
 #include "SkIntersections.h"
 #include "SkTSort.h"
 
 #ifdef SK_DEBUG
 typedef uint8_t SkOpDebugBool;
 #else
@@ skipping 2217 matching lines @@
         } else if (intersections->isCoincident(index + 1)) {
             intersections->removeOne(index + 1);
             --last;
         } else {
             intersections->setCoincident(index++);
         }
         intersections->setCoincident(index);
     }
     SkASSERT(intersections->used() <= TCurve::kMaxIntersections);
 }
+
+#endif