Fix SkTextBlob offset semantics.

src/gpu/GrStencilAndCoverTextContext.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 GrStencilAndCoverTextContext_DEFINED
 #define GrStencilAndCoverTextContext_DEFINED
 
@@ skipping 14 matching lines @@
 class GrStencilAndCoverTextContext : public GrTextContext {
 public:
     GrStencilAndCoverTextContext(GrContext*, const SkDeviceProperties&);
     virtual ~GrStencilAndCoverTextContext();
 
     virtual void drawText(const GrPaint&, const SkPaint&, const char text[],
                           size_t byteLength,
                           SkScalar x, SkScalar y) SK_OVERRIDE;
     virtual void drawPosText(const GrPaint&, const SkPaint&,
                              const char text[], size_t byteLength,
-                             const SkScalar pos[], SkScalar constY,
-                             int scalarsPerPosition) SK_OVERRIDE;
+                             const SkScalar pos[], int scalarsPerPosition,
+                             const SkPoint& offset) SK_OVERRIDE;
 
     virtual bool canDraw(const SkPaint& paint) SK_OVERRIDE;
 
 private:
     static const int kGlyphBufferSize = 1024;
 
     enum RenderMode {
         /**
          * This is the render mode used by drawText(), which is mainly used by
          * the Skia unit tests. It tries match the other text backends exactly,
          * with the exception of not implementing LCD text, and doing anti-
          * aliasing with the built-in MSAA.
          */
         kMaxAccuracy_RenderMode,
 
         /**
          * This is the render mode used by drawPosText(). It ignores hinting and
          * LCD text, even if the client provided positions for hinted glyphs,
          * and renders from a canonically-sized, generic set of paths for the
          * given typeface. In the future we should work out a system for the
          * client to know it should not provide hinted glyph positions. This
          * render mode also tries to use GPU stroking for fake bold, even when
          * SK_USE_FREETYPE_EMBOLDEN is set.
          */
         kMaxPerformance_RenderMode,
     };
 
     void init(const GrPaint&, const SkPaint&, size_t textByteLength,
-              RenderMode, SkScalar textTranslateY = 0);
+              RenderMode, const SkPoint& textTranslate);
     void initGlyphs(SkGlyphCache* cache);
     void appendGlyph(uint16_t glyphID, float x);
     void appendGlyph(uint16_t glyphID, float x, float y);
     void flush();
     void finish();
 
     GrDrawState::AutoRestoreEffects fStateRestore;
     SkScalar fTextRatio;
     float fTextInverseRatio;
     SkGlyphCache* fGlyphCache;
     GrPathRange* fGlyphs;
     uint32_t fIndexBuffer[kGlyphBufferSize];
     float fTransformBuffer[2 * kGlyphBufferSize];
     GrDrawTarget::PathTransformType fTransformType;
     int fPendingGlyphCount;
     SkMatrix fContextInitialMatrix;
     bool fNeedsDeviceSpaceGlyphs;
 };
 
 #endif