Split drawing functionality out of GrContext and into new GrDrawContext

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 35 matching lines @@
     GrContext*                     fContext;
     // TODO we probably don't really need to store a back pointer to the owning SkGpuDevice, except
     // we need to be able to call drawPath on it in the event no other text context can draw the
     // text.  We might be able to move this logic to context though.  This is unreffed because
     // GrTextContext is completely owned by SkGpuDevice
     SkGpuDevice*                   fGpuDevice;
     SkDeviceProperties             fDeviceProperties;
 
     SkAutoTUnref<GrRenderTarget>   fRenderTarget;
     GrClip                         fClip;
-    GrDrawTarget*                  fDrawTarget;
     SkIRect                        fClipRect;
     SkIRect                        fRegionClipBounds;
     GrPaint                        fPaint;
     SkPaint                        fSkPaint;
 
     GrTextContext(GrContext*, SkGpuDevice*, const SkDeviceProperties&);
 
     virtual bool canDraw(const GrRenderTarget*, const GrClip&, const GrPaint&,
                          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, const SkIRect& clipBounds) = 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, const SkIRect& clipBounds) = 0;
 
     void drawTextAsPath(const SkPaint& origPaint, const SkMatrix& viewMatrix,
                         const char text[], size_t byteLength, SkScalar x, SkScalar y,
                         const SkIRect& clipBounds);
     void drawPosTextAsPath(const SkPaint& origPaint, const SkMatrix& viewMatrix,
                            const char text[], size_t byteLength,
                            const SkScalar pos[], int scalarsPerPosition,
                            const SkPoint& offset, const SkIRect& clipBounds);
 
     void init(GrRenderTarget*, const GrClip&, const GrPaint&, const SkPaint&,
               const SkIRect& regionClipBounds);
-    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);
 
     friend class BitmapTextBatch;
 };
 
 #endif