[Android] Add a java.lang.System wrapper.

base/android/java_system.h

+// Copyright (c) 2015 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 BASE_ANDROID_JAVA_SYSTEM_H_
+#define BASE_ANDROID_JAVA_SYSTEM_H_
+
+#include <string>
+
+#include "base/android/jni_android.h"
+#include "base/base_export.h"
+#include "base/strings/string_piece.h"
+
+namespace base {
+namespace android {
+
+// Wrapper class for using the java.lang.System object from jni.
+class BASE_EXPORT JavaSystem {
+ public:
+  // Registers the jni class (once per process).
+  static bool Register(JNIEnv* env);
+
+  // See java.lang.System.getProperty().
+  static std::string GetProperty(const base::StringPiece& stroperty_name);
+};
+
+}  // namespace android
+}  // namespace base
+
+#endif  // BASE_ANDROID_JAVA_SYSTEM_H_