Make the UI an observer of downloads.

content/browser/download/save_package.cc

 // 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.
 
 #include "content/browser/download/save_package.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/file_util.h"
@@ skipping 87 matching lines @@
 }
 
 // Check whether we can save page as complete-HTML for the contents which
 // have specified a MIME type. Now only contents which have the MIME type
 // "text/html" can be saved as complete-HTML.
 bool CanSaveAsComplete(const std::string& contents_mime_type) {
   return contents_mime_type == "text/html" ||
          contents_mime_type == "application/xhtml+xml";
 }
 
+// Request handle for SavePackage downloads. Currently doesn't support
+// pause/resume/cancel, but returns a WebContents.
+class SavePackageRequestHandle : public DownloadRequestHandleInterface {
+ public:
+  SavePackageRequestHandle(base::WeakPtr<SavePackage> save_package)
+      : save_package_(save_package) {}
+
+  // DownloadRequestHandleInterface
+  virtual WebContents* GetWebContents() const OVERRIDE {
+    return save_package_.get() ? save_package_->web_contents() : NULL;
+  }
+  virtual DownloadManager* GetDownloadManager() const OVERRIDE {
+    return NULL;
+  }
+  virtual void PauseRequest() const OVERRIDE {}
+  virtual void ResumeRequest() const OVERRIDE {}
+  virtual void CancelRequest() const OVERRIDE {}
+  virtual std::string DebugString() const OVERRIDE {
+    return "SavePackage DownloadRequestHandle";
+  }
+
+ private:
+  base::WeakPtr<SavePackage> save_package_;
+};
+
 }  // namespace
 
 const base::FilePath::CharType SavePackage::kDefaultHtmlExtension[] =
 #if defined(OS_WIN)
     FILE_PATH_LITERAL("htm");
 #else
     FILE_PATH_LITERAL("html");
 #endif
 
 SavePackage::SavePackage(WebContents* web_contents,
@@ skipping 160 matching lines @@
 
   wait_state_ = START_PROCESS;
 
   // Initialize the request context and resource dispatcher.
   BrowserContext* browser_context = web_contents()->GetBrowserContext();
   if (!browser_context) {
     NOTREACHED();
     return false;
   }
 
+  scoped_ptr<DownloadRequestHandleInterface> request_handle(
+      new SavePackageRequestHandle(AsWeakPtr()));
   // The download manager keeps ownership but adds us as an observer.
   download_ = download_manager_->CreateSavePackageDownloadItem(
       saved_main_file_path_,
       page_url_,
       ((save_type_ == SAVE_PAGE_TYPE_AS_MHTML) ?
        "multipart/related" : "text/html"),
+      request_handle.Pass(),
       this);
   // Confirm above didn't delete the tab out from under us.
   if (!download_created_callback.is_null())
     download_created_callback.Run(download_);
 
   // Check save type and process the save page job.
   if (save_type_ == SAVE_PAGE_TYPE_AS_COMPLETE_HTML) {
     // Get directory
     DCHECK(!saved_main_directory_path_.empty());
     GetAllSavableResourceLinksForCurrentPage();
@@ skipping 1095 matching lines @@
 
 void SavePackage::FinalizeDownloadEntry() {
   DCHECK(download_);
   DCHECK(download_manager_);
 
   download_manager_->OnSavePackageSuccessfullyFinished(download_);
   StopObservation();
 }
 
 }  // namespace content