Add copyright headers to remaining gyp files.

gyp/pathops.gypi

+# Copyright 2015 Google Inc.
+#
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
 {
   'include_dirs' : [
     '../include/pathops',
     '../src/pathops',
   ],
   'sources': [
     '../include/pathops/SkPathOps.h',
     '../src/pathops/SkAddIntersections.cpp',
     '../src/pathops/SkDCubicIntersection.cpp',
     '../src/pathops/SkDCubicLineIntersection.cpp',
@@ skipping 41 matching lines @@
     '../src/pathops/SkPathOpsPoint.h',
     '../src/pathops/SkPathOpsQuad.h',
     '../src/pathops/SkPathOpsRect.h',
     '../src/pathops/SkPathOpsTriangle.h',
     '../src/pathops/SkPathOpsTypes.h',
     '../src/pathops/SkPathWriter.h',
     '../src/pathops/SkQuarticRoot.h',
     '../src/pathops/SkReduceOrder.h',
   ],
 }