Add optional sw generated path coverage mask caching

src/gpu/GrContext.cpp

Index: src/gpu/GrContext.cpp
diff --git a/src/gpu/GrContext.cpp b/src/gpu/GrContext.cpp
index fbb59a3e9a678823302dfbc1dca08b8c088e0b1b..6cec1da86bdc8f5da6ddeeeb12964c4cc044d1bd 100644
--- a/src/gpu/GrContext.cpp
+++ b/src/gpu/GrContext.cpp
@@ -97,6 +97,8 @@ void GrContext::initCommon(const GrContextOptions& options) {
     dtOptions.fMaxBatchLookahead = options.fMaxBatchLookahead;
     GrPathRendererChain::Options prcOptions;
     prcOptions.fDisableDistanceFieldRenderer = options.fDisableDistanceFieldPaths;
+    prcOptions.fAllowPathMaskCaching = options.fAllowPathMaskCaching;
+    prcOptions.fDisableAllPathRenderers = options.fForceSWPathMasks;
     fDrawingManager.reset(new GrDrawingManager(this, dtOptions, prcOptions, options.fImmediateMode,
                                                &fSingleOwner));