dump HWC state in dumpsys

Change-Id: Ifbb38ca1ac9685776250e01c8d02021b35af72cf
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 06c86dd..b353bff 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -1533,6 +1533,7 @@
                 hwc.initCheck()==NO_ERROR ? "present" : "not present",
                 mDebugDisableHWC ? "disabled" : "enabled");
         result.append(buffer);
+        hwc.dump(result, buffer, SIZE);
 
         const GraphicBufferAllocator& alloc(GraphicBufferAllocator::get());
         alloc.dump(result);