Add GrContextOptions flag to disable distance field path renderer.

src/gpu/GrDrawingManager.cpp

Index: src/gpu/GrDrawingManager.cpp
diff --git a/src/gpu/GrDrawingManager.cpp b/src/gpu/GrDrawingManager.cpp
index e8cea756228c210e204ac95bca011071c94a6dfc..606a9abd6e43c3530661e3e2c28e3949cdac6ed6 100644
--- a/src/gpu/GrDrawingManager.cpp
+++ b/src/gpu/GrDrawingManager.cpp
@@ -197,7 +197,7 @@ GrPathRenderer* GrDrawingManager::getPathRenderer(const GrPathRenderer::CanDrawP
                                                   GrPathRenderer::StencilSupport* stencilSupport) {
 
     if (!fPathRendererChain) {
-        fPathRendererChain = new GrPathRendererChain(fContext);
+        fPathRendererChain = new GrPathRendererChain(fContext, fOptionsForPathRendererChain);
     }
 
     GrPathRenderer* pr = fPathRendererChain->getPathRenderer(args, drawType, stencilSupport);