[Offline Pages] Add an observer for requests in the CCT namespace.

chrome/browser/android/offline_pages/cct_request_observer.h

+// Copyright 2017 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_OFFLINE_PAGES_CCT_REQUEST_OBSERVER_H_
+#define CHROME_BROWSER_ANDROID_OFFLINE_PAGES_CCT_REQUEST_OBSERVER_H_
+
+#include <stdint.h>
+
+#include "base/android/jni_android.h"
+#include "base/android/jni_weak_ref.h"
+#include "base/macros.h"
+#include "base/supports_user_data.h"
+#include "components/offline_pages/core/downloads/download_ui_adapter.h"
+
+namespace offline_pages {
+
+/**
+ * Bridge between C++ and Java for exposing when CCT offlining requests
+ * complete.
+ */
+class CCTRequestObserver : public RequestCoordinator::Observer,
+                           public base::SupportsUserData::Data {
+ public:
+  static void AttachToRequestCoordinator(RequestCoordinator* coordinator);
+  ~CCTRequestObserver() override;
+
+  // RequestCoordinator::Observer implementation.
+  void OnAdded(const SavePageRequest& request) override;
+  void OnCompleted(const SavePageRequest& request,
+                   RequestNotifier::BackgroundSavePageResult status) override;
+  void OnChanged(const SavePageRequest& request) override;
+  void OnNetworkProgress(const SavePageRequest& request,
+                         int64_t received_bytes) override;
+
+ private:
+  explicit CCTRequestObserver(
+      base::android::ScopedJavaLocalRef<jobject> callback);
+
+  base::android::ScopedJavaGlobalRef<jobject> j_callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(CCTRequestObserver);
+};
+
+}  // namespace offline_pages
+
+#endif  // CHROME_BROWSER_ANDROID_OFFLINE_PAGES_CCT_REQUEST_OBSERVER_H_