Implement caching in the tessellating path renderer, including strokes.

src/gpu/GrDrawContext.cpp

Index: src/gpu/GrDrawContext.cpp
diff --git a/src/gpu/GrDrawContext.cpp b/src/gpu/GrDrawContext.cpp
index 288841c1120abbcb8e61db4d49b447a369d547c3..4087692518cea9dacdd0c0842add3368cdd4f407 100644
--- a/src/gpu/GrDrawContext.cpp
+++ b/src/gpu/GrDrawContext.cpp
@@ -1058,7 +1058,9 @@ void GrDrawContext::drawPath(GrRenderTarget* rt,
                              const GrPaint& paint,
                              const SkMatrix& viewMatrix,
                              const SkPath& path,
-                             const GrStrokeInfo& strokeInfo) {
+                             const GrStrokeInfo& strokeInfo,
+                             const SkPath* origSrcPath,
+                             const GrStrokeInfo* origStrokeInfo) {
     RETURN_IF_ABANDONED
     if (path.isEmpty()) {
        if (path.isInverseFillType()) {
@@ -1110,7 +1112,7 @@ void GrDrawContext::drawPath(GrRenderTarget* rt,
         }
     }
     this->internalDrawPath(fDrawTarget, &pipelineBuilder, viewMatrix, color, paint.isAntiAlias(),
-                           path, strokeInfo);
+                           path, strokeInfo, origSrcPath, origStrokeInfo);
 }
 
 void GrDrawContext::internalDrawPath(GrDrawTarget* target,
@@ -1119,7 +1121,9 @@ void GrDrawContext::internalDrawPath(GrDrawTarget* target,
                                      GrColor color,
                                      bool useAA,
                                      const SkPath& path,
-                                     const GrStrokeInfo& strokeInfo) {
+                                     const GrStrokeInfo& strokeInfo,
+                                     const SkPath* origSrcPath,
+                                     const GrStrokeInfo* origStrokeInfo) {
     RETURN_IF_ABANDONED
     SkASSERT(!path.isEmpty());
 
@@ -1199,6 +1203,8 @@ void GrDrawContext::internalDrawPath(GrDrawTarget* target,
     args.fPath = pathPtr;
     args.fStroke = strokeInfoPtr;
     args.fAntiAlias = useCoverageAA;
+    args.fOrigSrcPath = origSrcPath;
+    args.fOrigStrokeInfo = origStrokeInfo;
     pr->drawPath(args);
 }