Implement the skeleton of an android content shell.

base/android/jni_helper.h

+// Copyright (c) 2012 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_JNI_HELPER_H_
+#define BASE_ANDROID_JNI_HELPER_H_
+
+#include <jni.h>
+
+#include "base/android/scoped_java_ref.h"
+
+// Manages WeakGlobalRef lifecycle.
+class JavaObjectWeakGlobalRef {
+ public:
+  JavaObjectWeakGlobalRef(JNIEnv* env, jobject obj);
+  virtual ~JavaObjectWeakGlobalRef();
+
+  base::android::ScopedJavaLocalRef<jobject> get(JNIEnv* env) const;
+
+ private:
+  jweak obj_;
+
+  DISALLOW_COPY_AND_ASSIGN(JavaObjectWeakGlobalRef);
+};
+
+// Get the real object stored in the weak reference returned as a
+// ScopedJavaLocalRef.
+base::android::ScopedJavaLocalRef<jobject> GetRealObject(
+    JNIEnv* env, jobject obj);
+
+#endif  // BASE_ANDROID_JNI_HELPER_H_