Move clip mask generation into GrReducedClip

include/gpu/GrContext.h

Index: include/gpu/GrContext.h
diff --git a/include/gpu/GrContext.h b/include/gpu/GrContext.h
index 41292fe5cde94558f0f5f480eb68a64ec0204c7c..5785553dfdeae753b36233d1c81b2e3bfa663cea 100644
--- a/include/gpu/GrContext.h
+++ b/include/gpu/GrContext.h
@@ -430,12 +430,8 @@ private:
     GrAuditTrail                            fAuditTrail;
 
     // TODO: have the GrClipStackClip use drawContexts and rm this friending
-    friend class GrClipStackClip;  // for access to drawingManager
-    friend class GrDrawingManager; // for access to drawingManager for ProgramUnitTest
     friend class GrContextPriv;
 
-    GrDrawingManager* drawingManager() { return fDrawingManager; }
-
     GrContext(); // init must be called after the constructor.
     bool init(GrBackend, GrBackendContext, const GrContextOptions& options);