Add GrRenderTarget parameter to GrTextContext::canDraw

src/gpu/GrTextContext.h

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrTextContext_DEFINED
 #define GrTextContext_DEFINED
 
@@ skipping 32 matching lines @@
 
     SkAutoTUnref<GrRenderTarget>   fRenderTarget;
     GrClip                         fClip;
     GrDrawTarget*                  fDrawTarget;
     SkIRect                        fClipRect;
     GrPaint                        fPaint;
     SkPaint                        fSkPaint;
 
     GrTextContext(GrContext*, const SkDeviceProperties&);
 
-    virtual bool canDraw(const SkPaint& paint, const SkMatrix& viewMatrix) = 0;
+    virtual bool canDraw(const GrRenderTarget*, const SkPaint&, const SkMatrix& viewMatrix) = 0;
 
     virtual void onDrawText(GrRenderTarget*, const GrClip&, const GrPaint&, const SkPaint&,
                             const SkMatrix& viewMatrix, const char text[], size_t byteLength,
                             SkScalar x, SkScalar y) = 0;
     virtual void onDrawPosText(GrRenderTarget*, const GrClip&, const GrPaint&, const SkPaint&,
                                const SkMatrix& viewMatrix,
                                const char text[], size_t byteLength,
                                const SkScalar pos[], int scalarsPerPosition,
                                const SkPoint& offset) = 0;
 
     void init(GrRenderTarget*, const GrClip&, const GrPaint&, const SkPaint&);
     void finish() { fDrawTarget = NULL; }
 
     static GrFontScaler* GetGrFontScaler(SkGlyphCache* cache);
     // sets extent in stopVector and returns glyph count
     static int MeasureText(SkGlyphCache* cache, SkDrawCacheProc glyphCacheProc,
                            const char text[], size_t byteLength, SkVector* stopVector);
 };
 
 #endif