Implement Android key/value backup

chrome/browser/android/chrome_backup_agent.h

+// Copyright 2016 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 CHROME_BROWSER_ANDROID_CHROME_BACKUP_AGENT_H_
+#define CHROME_BROWSER_ANDROID_CHROME_BACKUP_AGENT_H_
+
+#include <jni.h>
+
+#include <string>
+#include <vector>
+
+#include "base/android/jni_android.h"
+
+namespace chrome {
+namespace android {
+
+std::vector<std::string> GetBackupPrefNames();
+
+bool RegisterBackupAgent(JNIEnv* env);
+
+// Test interface wrapping the static functions that are only called from Java.
+base::android::ScopedJavaLocalRef<jobjectArray> GetBoolBackupNamesForTesting(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jobject>& jcaller);
+base::android::ScopedJavaLocalRef<jbooleanArray> GetBoolBackupValuesForTesting(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jobject>& jcaller);
+void SetBoolBackupPrefsForTesting(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jobject>& jcaller,
+    const base::android::JavaParamRef<jobjectArray>& names,
+    const base::android::JavaParamRef<jbooleanArray>& values);
+
+}  //  namespace android
+}  //  namespace chrome
+
+#endif  // CHROME_BROWSER_ANDROID_CHROME_BACKUP_AGENT_H_