Migrate files to embedder.

runtime/embedders/android/input_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_INPUT_HANDLER_H_
+#define EMBEDDERS_ANDROID_INPUT_HANDLER_H_
+
+#include <android/input.h>
+
+class InputHandler {
+  public:
+    virtual int32_t Start() { return 0; }
+    virtual bool OnTouchEvent(AInputEvent* event) = 0;
+    virtual bool OnKeyEvent(AInputEvent* event) = 0;
+    virtual ~InputHandler() {}
+};
+
+#endif  // EMBEDDERS_ANDROID_INPUT_HANDLER_H_