added a few more commands to SF's dumpsys

--latency-clear [name]
clears the latency data for the specified layer or for
all layers if none is specified

--list
prints the list of all layers regardless of their visibility

Change-Id: I7c07ae020f838c173b98ee50f3fb3e93da78acbb
diff --git a/services/surfaceflinger/Layer.h b/services/surfaceflinger/Layer.h
index b3fa5e7..2dd4da1 100644
--- a/services/surfaceflinger/Layer.h
+++ b/services/surfaceflinger/Layer.h
@@ -88,6 +88,7 @@
     virtual void onFirstRef();
     virtual void dump(String8& result, char* scratch, size_t size) const;
     virtual void dumpStats(String8& result, char* buffer, size_t SIZE) const;
+    virtual void clearStats();
 
 private:
     friend class SurfaceTextureLayer;