Create GrDraw and start fast pathing src over rects

include/gpu/GrDrawContext.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrDrawContext_DEFINED
 #define GrDrawContext_DEFINED
 
 #include "GrColor.h"
 #include "SkRefCnt.h"
 #include "SkSurfaceProps.h"
 
+class GrBatch;
 class GrClip;
 class GrContext;
+class GrDraw;
 class GrDrawBatch;
 class GrDrawTarget;
 class GrPaint;
 class GrPathProcessor;
 class GrPathRangeDraw;
 class GrPipelineBuilder;
 class GrRenderTarget;
 class GrStrokeInfo;
 class GrSurface;
 class GrTextContext;
@@ skipping 225 matching lines @@
 
 
     /**
      * Draws a batch
      *
      * @param paint    describes how to color pixels.
      * @param batch    the batch to draw
      */
     void drawBatch(GrRenderTarget*, const GrClip&, const GrPaint&, GrDrawBatch*);
 
+    // This entry point is currently only used for text contexts and the experimental GrDraw
+    void drawBatch(const GrPipelineBuilder& pipelineBuilder, GrDrawBatch* batch);
+
+    // returns the last batch, or a null pointer if none is available.  This is so internal clients
+    // can fast path batching
+    GrBatch* lastBatch();
+
 private:
-    friend class GrAtlasTextContext; // for access to drawBatch
     friend class GrContext; // for ctor
 
     GrDrawContext(GrContext*, GrDrawTarget*, const SkSurfaceProps&);
 
     GrTextContext* createTextContext(GrRenderTarget*, const SkSurfaceProps&);
 
     // Checks if the context has been abandoned and if the rendertarget is owned by this context
     bool prepareToDraw(GrRenderTarget* rt);
 
     void internalDrawPath(GrDrawTarget*,
                           GrPipelineBuilder*,
                           const SkMatrix& viewMatrix,
                           GrColor,
                           bool useAA,
                           const SkPath&,
                           const GrStrokeInfo&);
 
-    // This entry point allows the GrTextContext-derived classes to add their batches to
-    // the drawTarget.
-    void drawBatch(GrPipelineBuilder* pipelineBuilder, GrDrawBatch* batch);
-
     GrContext*          fContext;     // owning context -> no ref
     GrDrawTarget*       fDrawTarget;
     GrTextContext*      fTextContext; // lazily created
 
     SkSurfaceProps      fSurfaceProps;
 };
 
 #endif