Implement caching in the tessellating path renderer, including strokes.

src/gpu/GrBlurUtils.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrBlurUtils.h"
 #include "GrDrawContext.h"
 #include "GrCaps.h"
@@ skipping 138 matching lines @@
                                          const GrClip& clip,
                                          const SkPath& origSrcPath,
                                          const SkPaint& paint,
                                          const SkMatrix& origViewMatrix,
                                          const SkMatrix* prePathMatrix,
                                          const SkIRect& clipBounds,
                                          bool pathIsMutable) {
     SkASSERT(!pathIsMutable || origSrcPath.isVolatile());
 
     GrStrokeInfo strokeInfo(paint);
+    GrStrokeInfo origStrokeInfo(strokeInfo);
 
     // If we have a prematrix, apply it to the path, optimizing for the case
     // where the original path can in fact be modified in place (even though
     // its parameter type is const).
     SkPath* pathPtr = const_cast<SkPath*>(&origSrcPath);
     SkTLazy<SkPath> tmpPath;
     SkTLazy<SkPath> effectPath;
     SkPathEffect* pathEffect = paint.getPathEffect();
 
     SkMatrix viewMatrix = origViewMatrix;
@@ skipping 114 matching lines @@
         // draw the mask on the CPU - this is a fallthrough path in case the
         // GPU path fails
         SkPaint::Style style = strokeInfo.isHairlineStyle() ? SkPaint::kStroke_Style :
                                                               SkPaint::kFill_Style;
         draw_with_mask_filter(drawContext, context->textureProvider(), renderTarget,
                               clip, viewMatrix, *devPathPtr,
                               paint.getMaskFilter(), clipBounds, &grPaint, style);
         return;
     }
 
-    drawContext->drawPath(renderTarget, clip, grPaint, viewMatrix, *pathPtr, strokeInfo);
+    drawContext->drawPath(renderTarget, clip, grPaint, viewMatrix, *pathPtr, strokeInfo, &origSrcPath, &origStrokeInfo);
 }