Fix SkTextBlob offset semantics.

src/pdf/SkPDFDeviceFlattener.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPDFDeviceFlattener.h"
 #include "SkDraw.h"
 
@@ skipping 105 matching lines @@
                                     SkScalar x, SkScalar y, const SkPaint& paint) {
     if (mustPathText(d, paint)) {
         d.drawText_asPaths((const char*)text, len, x, y, paint);
         return;
     }
 
     INHERITED::drawText(d, text, len, x, y, paint);
 }
 
 void SkPDFDeviceFlattener::drawPosText(const SkDraw& d, const void* text, size_t len,
-                                       const SkScalar pos[], SkScalar constY,
-                                       int scalarsPerPos, const SkPaint& paint) {
+                                       const SkScalar pos[], int scalarsPerPos,
+                                       const SkPoint& offset, const SkPaint& paint) {
     if (mustPathText(d, paint)) {
-        d.drawPosText_asPaths((const char*)text, len, pos, constY, scalarsPerPos, paint);
+        d.drawPosText_asPaths((const char*)text, len, pos, scalarsPerPos, offset, paint);
         return;
     }
-    INHERITED::drawPosText(d, text, len, pos, constY,scalarsPerPos, paint);
+    INHERITED::drawPosText(d, text, len, pos, scalarsPerPos, offset, paint);
 }
 
 void SkPDFDeviceFlattener::drawTextOnPath(const SkDraw& d, const void* text, size_t len,
                                           const SkPath& path, const SkMatrix* matrix,
                                           const SkPaint& paint) {
     if (mustPathText(d, paint) || (matrix && matrix->hasPerspective())) {
         d.drawTextOnPath((const char*)text, len, path, matrix, paint);
         return;
     }
     INHERITED::drawTextOnPath(d, text, len, path, matrix, paint);
 }
 
 bool SkPDFDeviceFlattener::mustFlatten(const SkDraw& d) const {
     // TODO(edisonn): testability, add flag to force return true.
     return d.fMatrix->hasPerspective();
 }
 
 bool SkPDFDeviceFlattener::mustPathText(const SkDraw& d, const SkPaint&) {
     // TODO(edisonn): testability, add flag to force return true.
     // TODO(edisonn): TBD: How to flatten MaskFilter.
     return d.fMatrix->hasPerspective();
 }