Reland of Android: support multiple displays on C++ side

ui/display/android/jni_registrar.h

Index: ui/display/android/jni_registrar.h
diff --git a/ui/display/android/jni_registrar.h b/ui/display/android/jni_registrar.h
new file mode 100644
index 0000000000000000000000000000000000000000..5d33b14ab787835eff16dd3e672f564703ae58d4
--- /dev/null
+++ b/ui/display/android/jni_registrar.h
@@ -0,0 +1,18 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef UI_DISPLAY_ANDROID_JNI_REGISTRAR_H_
+#define UI_DISPLAY_ANDROID_JNI_REGISTRAR_H_
+
+#include <jni.h>
+
+#include "ui/display/display_export.h"
+
+namespace display {
+
+DISPLAY_EXPORT bool RegisterJni(JNIEnv* env);
+
+}  // namespace display
+
+#endif  // UI_DISPLAY_ANDROID_JNI_REGISTRAR_H_