Frameworks/native: Wall Werror in surfaceflinger

Turn on -Wall -Werror in services/surfaceflinger. Fix warnings.

Change-Id: Ifef830300d9d4bc657d8f1257c02bfe8c2b4d9c5
diff --git a/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.h b/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.h
index 363dce2..0fab7e2 100644
--- a/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.h
+++ b/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.h
@@ -86,6 +86,7 @@
     virtual status_t compositionComplete();
     virtual status_t advanceFrame();
     virtual void onFrameCommitted();
+    using BBinder::dump;
     virtual void dump(String8& result) const;
     virtual void resizeBuffers(const uint32_t w, const uint32_t h);