[Downloads] Expose basic download history to UI

chrome/browser/android/download/download_manager_service.h

 // Copyright 2015 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_DOWNLOAD_DOWNLOAD_MANAGER_SERVICE_H_
 #define CHROME_BROWSER_ANDROID_DOWNLOAD_DOWNLOAD_MANAGER_SERVICE_H_
 
 #include <jni.h>
 #include <map>
 #include <string>
@@ skipping 34 matching lines @@
                       const JavaParamRef<jstring>& jdownload_guid,
                       bool is_off_the_record,
                       bool is_notification_dismissed);
 
   // Called to pause a download item that has GUID equal to |jdownload_guid|.
   // If the DownloadItem is not yet created, do nothing as it is already paused.
   void PauseDownload(JNIEnv* env,
                      jobject obj,
                      const JavaParamRef<jstring>& jdownload_guid);
 
+  // Called to request that the DownloadManagerService return data about all
+  // downloads in the user's history.
+  void GetAllDownloads(JNIEnv* env, const JavaParamRef<jobject>& obj);
+
   // DownloadHistory::Observer methods.
   void OnHistoryQueryComplete() override;
 
  protected:
   // Called to get the content::DownloadManager instance.
   virtual content::DownloadManager* GetDownloadManager(bool is_off_the_record);
 
  private:
   // For testing.
   friend class DownloadManagerServiceTest;
 
   // Helper function to start the download resumption.
   void ResumeDownloadInternal(const std::string& download_guid);
 
   // Helper function to cancel a download.
   void CancelDownloadInternal(const std::string& download_guid,
                               bool is_off_the_record);
 
   // Helper function to pause a download.
   void PauseDownloadInternal(const std::string& download_guid);
 
+  // Helper function to send info about all downloads to the Java-side.
+  void GetAllDownloadsInternal();
+
   // Called to notify the java side that download resumption failed.
   void OnResumptionFailed(const std::string& download_guid);
 
   void OnResumptionFailedInternal(const std::string& download_guid);
 
   typedef base::Callback<void(bool)> ResumeCallback;
   void set_resume_callback_for_testing(const ResumeCallback& resume_cb) {
     resume_callback_for_testing_ = resume_cb;
   }
 
   // Reference to the Java object.
   base::android::ScopedJavaGlobalRef<jobject> java_ref_;
 
   bool is_history_query_complete_;
 
-  enum DownloadAction { RESUME, PAUSE, CANCEL, UNKNOWN };
+  enum DownloadAction { RESUME, PAUSE, CANCEL, INITIALIZE_UI, UNKNOWN };
 
   using PendingDownloadActions = std::map<std::string, DownloadAction>;
   PendingDownloadActions pending_actions_;
 
   void EnqueueDownloadAction(const std::string& download_guid,
                              DownloadAction action);
 
   ResumeCallback resume_callback_for_testing_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadManagerService);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_DOWNLOAD_DOWNLOAD_MANAGER_SERVICE_H_