Fix SkTextBlob offset semantics.

include/device/xps/SkXPSDevice.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkXPSDevice_DEFINED
 #define SkXPSDevice_DEFINED
 
@@ skipping 100 matching lines @@
 
     virtual void drawText(
         const SkDraw&,
         const void* text, size_t len,
         SkScalar x, SkScalar y,
         const SkPaint& paint) SK_OVERRIDE;
 
     virtual void drawPosText(
         const SkDraw&,
         const void* text, size_t len,
-        const SkScalar pos[], SkScalar constY, int scalarsPerPos,
-        const SkPaint& paint) SK_OVERRIDE;
+        const SkScalar pos[], int scalarsPerPos,
+        const SkPoint& offset, const SkPaint& paint) SK_OVERRIDE;
 
     virtual void drawTextOnPath(
         const SkDraw&,
         const void* text, size_t len,
         const SkPath& path,
         const SkMatrix* matrix,
         const SkPaint& paint) SK_OVERRIDE;
 
     virtual void drawVertices(
         const SkDraw&,
@@ skipping 189 matching lines @@
     virtual SkBaseDevice* onCreateDevice(const SkImageInfo&, Usage) SK_OVERRIDE;
 
     // Disable the default copy and assign implementation.
     SkXPSDevice(const SkXPSDevice&);
     void operator=(const SkXPSDevice&);
 
     typedef SkBitmapDevice INHERITED;
 };
 
 #endif