Handle early pause, cancel for parallel requests.

content/browser/download/download_worker.h

Index: content/browser/download/download_worker.h
diff --git a/content/browser/download/download_worker.h b/content/browser/download/download_worker.h
index 62573e42496d6de9c88490fa1ac10a4d445900ab..55d83fe05f7c02e70d376cf2c1bb4da40e1e0ce6 100644
--- a/content/browser/download/download_worker.h
+++ b/content/browser/download/download_worker.h
@@ -12,6 +12,7 @@
 #include "content/browser/byte_stream.h"
 #include "content/browser/download/download_request_handle.h"
 #include "content/browser/download/url_downloader.h"
+#include "content/common/content_export.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/download_url_parameters.h"
 
@@ -21,7 +22,7 @@ namespace content {
 // file after handling response of the original non-range request.
 // TODO(xingliu): we should consider to reuse this class for single connection
 // download.
-class DownloadWorker : public UrlDownloader::Delegate {
+class CONTENT_EXPORT DownloadWorker : public UrlDownloader::Delegate {
  public:
   class Delegate {
    public:
@@ -34,6 +35,8 @@ class DownloadWorker : public UrlDownloader::Delegate {
     // Called when there is an error caused by the server response.
     virtual void OnServerResponseError(DownloadWorker* worker,
                                        DownloadInterruptReason reason) = 0;
+    virtual bool IsPaused() const = 0;
+    virtual bool IsCanceled() const = 0;
   };
 
   DownloadWorker(DownloadWorker::Delegate* delegate,