Add deprecation message.

Bug: None
Test: treehugger
Change-Id: I3a52883fba0e31f05e50cd51193bbb306418b18a
diff --git a/include/android/choreographer.h b/include/android/choreographer.h
index f999708..c4d1ca6 100644
--- a/include/android/choreographer.h
+++ b/include/android/choreographer.h
@@ -123,7 +123,7 @@
  */
 void AChoreographer_postFrameCallback(AChoreographer* choreographer,
                                       AChoreographer_frameCallback callback, void* data)
-        __INTRODUCED_IN(24) __DEPRECATED_IN(29);
+        __INTRODUCED_IN(24) __DEPRECATED_IN(29, "Use AChoreographer_postFrameCallback64 instead");
 
 /**
  * Deprecated: Use AChoreographer_postFrameCallbackDelayed64 instead.
@@ -131,7 +131,7 @@
 void AChoreographer_postFrameCallbackDelayed(AChoreographer* choreographer,
                                              AChoreographer_frameCallback callback, void* data,
                                              long delayMillis) __INTRODUCED_IN(24)
-        __DEPRECATED_IN(29);
+        __DEPRECATED_IN(29, "Use AChoreographer_postFrameCallbackDelayed64 instead");
 
 /**
  * Post a callback to be run on the next frame.  The data pointer provided will