Move clip mask generation into GrReducedClip

src/gpu/GrContextPriv.h

Index: src/gpu/GrContextPriv.h
diff --git a/src/gpu/GrContextPriv.h b/src/gpu/GrContextPriv.h
index 8646e25d49ed73281685269d5e7d2e5eb314d925..29eb151b6cc9f88a71917ca20a77fde05b46d0ce 100644
--- a/src/gpu/GrContextPriv.h
+++ b/src/gpu/GrContextPriv.h
@@ -15,6 +15,8 @@
     data members or virtual methods. */
 class GrContextPriv {
 public:
+    GrDrawingManager* drawingManager() { return fContext->fDrawingManager; }
+
     // Create a drawContext that wraps an existing renderTarget
     sk_sp<GrDrawContext> makeWrappedDrawContext(sk_sp<GrRenderTarget> rt,
                                                 sk_sp<SkColorSpace> colorSpace,