Migrate files to embedder.

runtime/embedders/android/activity_handler.h

Index: runtime/embedders/android/activity_handler.h
diff --git a/samples/android_sample/jni/activity_handler.h b/runtime/embedders/android/activity_handler.h
similarity index 63%
rename from samples/android_sample/jni/activity_handler.h
rename to runtime/embedders/android/activity_handler.h
index 2ecccf83aa1833626de02352402863b562532781..d19aaaa9b2d60294eeb41e6aa5635207b7b9b074 100644
--- a/samples/android_sample/jni/activity_handler.h
+++ b/runtime/embedders/android/activity_handler.h
@@ -1,5 +1,9 @@
-#ifndef ACTIVITY_HANDLER_H
-#define ACTIVITY_HANDLER_H
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#ifndef EMBEDDERS_ANDROID_ACTIVITY_HANDLER_H_
+#define EMBEDDERS_ANDROID_ACTIVITY_HANDLER_H_
 
 class ActivityHandler {
   public:
@@ -21,5 +25,4 @@ class ActivityHandler {
     virtual ~ActivityHandler() {}
 };
 
-#endif
-
+#endif  // EMBEDDERS_ANDROID_ACTIVITY_HANDLER_H_