Add a debug option to turn the "transformation hint" off

transformation hint is disabled with:

   adb shell service call SurfaceFlinger 1009 i32 1

Change-Id: I9aafe6f280f88ce41569ed69a06dc522b10e3a88
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index d68e484..5f8eb08 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -374,6 +374,7 @@
                 int                         mDebugBackground;
                 int                         mDebugDDMS;
                 int                         mDebugDisableHWC;
+                int                         mDebugDisableTransformHint;
                 volatile nsecs_t            mDebugInSwapBuffers;
                 nsecs_t                     mLastSwapBufferTime;
                 volatile nsecs_t            mDebugInTransaction;