Use CompositorFrameSinkSupport in tests.

This CL changes FrameSinkManagerTest to use CompositorFrameSinkSupport
instead of FrameSinkManagerClient. This will allow for
FrameSinkManagerClient to be deleted in a follow up CL and
FrameSinkManagerImpls internal data structures to be cleaned up.

Also rename SurfaceManagerOrderingParamTest to
FrameSinkManagerOrderingParamTest. This wasn't updated previously.

Bug: 792192
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: I0ad3f1e8f8530dccf001fe81c6c9191176dbaddf
Reviewed-on: https://chromium-review.googlesource.com/809614Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521912}

components/viz/service/frame_sinks/compositor_frame_sink_support.h

@@ -112,6 +112,8 @@ class VIZ_SERVICE_EXPORT CompositorFrameSinkSupport
   Surface* GetCurrentSurfaceForTesting();
 
  private:
+  friend class FrameSinkManagerTest;
+
   CompositorFrameSinkSupport(mojom::CompositorFrameSinkClient* client,
                              const FrameSinkId& frame_sink_id,
                              bool is_root,