[Android] Expose foreign session sync related funtionalities through JNI.

chrome/browser/android/foreign_session_helper.h

Index: chrome/browser/android/foreign_session_helper.h
diff --git a/chrome/browser/android/foreign_session_helper.h b/chrome/browser/android/foreign_session_helper.h
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+// Copyright 2013 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_FOREIGN_SESSION_HELPER_H_
+#define CHROME_BROWSER_ANDROID_FOREIGN_SESSION_HELPER_H_
+
+#include <jni.h>
+
+#include "base/android/scoped_java_ref.h"
+#include "base/basictypes.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/webui/session_favicon_source.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+
+using base::android::ScopedJavaLocalRef;
+
+struct SessionWindow;
+
+namespace browser_sync {
+class SessionModelAssociator;
+struct SyncedSession;
+}  // namespace browser_sync
+
+class ForeignSessionHelper : public content::NotificationObserver {
+ public:
+  explicit ForeignSessionHelper(Profile* profile);
+  void Destroy(JNIEnv* env, jobject obj);
+  jboolean IsTabSyncEnabled(JNIEnv* env, jobject obj);
+  void SetOnForeignSessionCallback(JNIEnv* env, jobject obj, jobject callback);
+  jboolean GetForeignSessions(JNIEnv* env, jobject obj, jobject result);
+  jboolean OpenForeignSessionTab(JNIEnv* env,
+                                 jobject obj,
+                                 jstring session_tag,
+                                 jint tab_id);
+  void SetForeignSessionCollapsed(JNIEnv* env,
+                                  jobject obj,
+                                  jstring session_tag,
+                                  jboolean is_collapsed);
+  void DeleteForeignSession(JNIEnv* env, jobject obj, jstring session_tag);
+
+  // NotificationObserver implemenation
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+  static bool RegisterForeignSessionHelper(JNIEnv* env);
+
+ private:
+  virtual ~ForeignSessionHelper();
+
+  Profile* profile_;  // weak
+  base::android::ScopedJavaGlobalRef<jobject> callback_;
+  content::NotificationRegistrar registrar_;
+
+  DISALLOW_COPY_AND_ASSIGN(ForeignSessionHelper);
+};
+
+#endif  // CHROME_BROWSER_ANDROID_FOREIGN_SESSION_HELPER_H_