Add AutoJObject and AutoGlobalJObject

base/android/auto_jobject.h

Index: base/android/auto_jobject.h
diff --git a/base/android/auto_jobject.h b/base/android/auto_jobject.h
new file mode 100644
index 0000000000000000000000000000000000000000..45e4088a73489a522e0fda529bb8d851bced5910
--- /dev/null
+++ b/base/android/auto_jobject.h
@@ -0,0 +1,39 @@
+// Copyright (c) 2011 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_AUTO_JOBJECT_H_
+#define BASE_ANDROID_AUTO_JOBJECT_H_
+
+#include <jni.h>
+
+namespace base {
+namespace android {
+
+// A helper class that automatically deletes the local reference to the jobject.
+class AutoJObject {
+ public:
+  // Takes ownership of |obj|.
+  static AutoJObject FromLocalRef(JNIEnv* env, jobject obj);
+
+  AutoJObject(const AutoJObject& other);
+  ~AutoJObject();
+
+  JNIEnv* env() const;
+  jobject obj() const;
+  // Releases the local reference to the caller. The caller *must* delete the
+  // local reference when it is done with it.
+  jobject Release();
+
+ private:
+  AutoJObject();  // Not permitted.
+  AutoJObject(JNIEnv* env, jobject obj);
+
+  JNIEnv* env_;
+  jobject obj_;
+};
+
+}  // namespace android
+}  // namespace base
+
+#endif  // BASE_ANDROID_AUTO_JOBJECT_H_