Migrate files to embedder.

runtime/embedders/android/timer.cc

Index: runtime/embedders/android/timer.cc
diff --git a/samples/android_sample/jni/timer.cc b/runtime/embedders/android/timer.cc
similarity index 94%
rename from samples/android_sample/jni/timer.cc
rename to runtime/embedders/android/timer.cc
index 4fcd035dbd54443b2a73f79b33f8613b0b5a9317..ccfd18b10e083e7e95bc2c3d084619643256f575 100644
--- a/samples/android_sample/jni/timer.cc
+++ b/runtime/embedders/android/timer.cc
@@ -2,7 +2,7 @@
 // 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.
 
-#include "jni/timer.h"
+#include "embedders/android/timer.h"
 
 Timer::Timer() : elapsed_(0.0f), last_time_(0.0) {
 }