Implement caching in the tessellating path renderer, including strokes.

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
 
@@ skipping 172 matching lines @@
      * @param viewMatrix    transformation matrix
      * @param path          the path to draw
      * @param strokeInfo    the stroke information (width, join, cap) and
      *                      the dash information (intervals, count, phase).
      */
     void drawPath(GrRenderTarget*,
                   const GrClip&,
                   const GrPaint&,
                   const SkMatrix& viewMatrix,
                   const SkPath&,
-                  const GrStrokeInfo&);
+                  const GrStrokeInfo&,
+                  const SkPath* origSrcPath = nullptr,
+                  const GrStrokeInfo* origStrokeInfo = nullptr);
 
     /**
      * Draws vertices with a paint.
      *
      * @param   paint           describes how to color pixels.
      * @param   viewMatrix      transformation matrix
      * @param   primitiveType   primitives type to draw.
      * @param   vertexCount     number of vertices.
      * @param   positions       array of vertex positions, required.
      * @param   texCoords       optional array of texture coordinates used
@@ skipping 44 matching lines @@
 
     // 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&);
+                          const GrStrokeInfo&,
+                          const SkPath* origSrcPath = nullptr,
+                          const GrStrokeInfo* origStrokeInfo = nullptr);
 
     // This entry point allows the GrTextContext-derived classes to add their batches to
     // the drawTarget.
     void drawBatch(GrPipelineBuilder* pipelineBuilder, GrBatch* batch);
 
     GrContext*          fContext;     // owning context -> no ref
     GrDrawTarget*       fDrawTarget;
     GrTextContext*      fTextContext; // lazily created
 
     SkSurfaceProps      fSurfaceProps;
 };
 
 #endif