hwc: Implement dump function

Does a basic implementation of the dump function
called by SurfaceFlinger in dumpsys.
Further logs in different areas can be added later on
using the dumpsys_log utility.

Change-Id: I2194b4ed7f10947272b7b824ef802ce2ee3c8a48
diff --git a/libhwcomposer/hwc_mdpcomp.cpp b/libhwcomposer/hwc_mdpcomp.cpp
index 8616719..4200be9 100644
--- a/libhwcomposer/hwc_mdpcomp.cpp
+++ b/libhwcomposer/hwc_mdpcomp.cpp
@@ -628,5 +628,15 @@
 
      return isMDPCompUsed;
 }
+
+void MDPComp::dump(android::String8& buf)
+{
+    dumpsys_log(buf, "  MDP Composition: ");
+    dumpsys_log(buf, "MDPCompState=%d\n", sMDPCompState);
+    //XXX: Log more info
+
+}
+
+
 }; //namespace