Implement chrome.downloads.onDeterminingFilename()

chrome/browser/download/download_service.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 CHROME_BROWSER_DOWNLOAD_DOWNLOAD_SERVICE_H_
 #define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_SERVICE_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/callback_forward.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/profiles/profile_keyed_service.h"
 
 class ChromeDownloadManagerDelegate;
 class DownloadHistory;
+class ExtensionDownloadsEventRouter;
 class Profile;
 
 namespace content {
 class DownloadManager;
 }
 
 // Owning class for ChromeDownloadManagerDelegate.
 class DownloadService : public ProfileKeyedService {
  public:
   explicit DownloadService(Profile* profile);
   virtual ~DownloadService();
 
   // Get the download manager delegate, creating it if it doesn't already exist.
   ChromeDownloadManagerDelegate* GetDownloadManagerDelegate();
 
   // Get the interface to the history system. Returns NULL if profile is
   // incognito or if the DownloadManager hasn't been created yet or if there is
   // no HistoryService for profile.
   DownloadHistory* GetDownloadHistory();
 
+#if !defined(OS_ANDROID)
+  ExtensionDownloadsEventRouter* GetExtensionEventRouter() {
+    return extension_event_router_.get();
+  }
+#endif
+
   // Has a download manager been created?
   bool HasCreatedDownloadManager();
 
   // Number of downloads associated with this instance of the service.
   int DownloadCount() const;
 
   // Number of downloads associated with all profiles.
   static int DownloadCountAllProfiles();
 
   // Sets the DownloadManagerDelegate associated with this object and
@@ skipping 10 matching lines @@
   bool download_manager_created_;
   Profile* profile_;
 
   // ChromeDownloadManagerDelegate may be the target of callbacks from
   // the history service/DB thread and must be kept alive for those
   // callbacks.
   scoped_refptr<ChromeDownloadManagerDelegate> manager_delegate_;
 
   scoped_ptr<DownloadHistory> download_history_;
 
+  // On Android, GET downloads are not handled by the DownloadManager.
+  // Once we have extensions on android, we probably need the EventRouter
+  // in ContentViewDownloadDelegate which knows about both GET and POST
+  // downloads.
+#if !defined(OS_ANDROID)
+  // The ExtensionDownloadsEventRouter dispatches download creation, change, and
+  // erase events to extensions. Like ChromeDownloadManagerDelegate, it's a
+  // chrome-level concept and its lifetime should match DownloadManager. There
+  // should be a separate EDER for on-record and off-record managers.
+  // There does not appear to be a separate ExtensionSystem for on-record and
+  // off-record profiles, so ExtensionSystem cannot own the EDER.
+  scoped_ptr<ExtensionDownloadsEventRouter> extension_event_router_;
+#endif
+
   DISALLOW_COPY_AND_ASSIGN(DownloadService);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_SERVICE_H_