Initial CL for Downloads resumption.

content/public/browser/download_url_parameters.h

Index: content/public/browser/download_url_parameters.h
diff --git a/content/public/browser/download_url_parameters.h b/content/public/browser/download_url_parameters.h
index f8bfa0a6da23ff17f50bdf85ef4dd08e32bcd6f2..a8e32586f155e8300eb1b6cdb6278ff597bc04b5 100644
--- a/content/public/browser/download_url_parameters.h
+++ b/content/public/browser/download_url_parameters.h
@@ -67,6 +67,12 @@ class CONTENT_EXPORT DownloadUrlParameters {
     referrer_encoding_ = referrer_encoding;
   }
   void set_load_flags(int load_flags) { load_flags_ |= load_flags; }
+  void set_last_modified(const std::string& last_modified) {
+    last_modified_ = last_modified;
+  }
+  void set_etag(const std::string& etag) {
+    etag_ = etag;
+  }
   void set_method(const std::string& method) {
     method_ = method;
   }
@@ -98,6 +104,8 @@ class CONTENT_EXPORT DownloadUrlParameters {
   const OnStartedCallback& callback() const { return callback_; }
   bool content_initiated() const { return content_initiated_; }
   int load_flags() const { return load_flags_; }
+  const std::string& last_modified() { return last_modified_; }
+  const std::string& etag() { return etag_; }
   const std::string& method() const { return method_; }
   const std::string& post_body() const { return post_body_; }
   int64 post_id() const { return post_id_; }
@@ -138,6 +146,8 @@ class CONTENT_EXPORT DownloadUrlParameters {
   bool content_initiated_;
   RequestHeadersType request_headers_;
   int load_flags_;
+  std::string last_modified_;
+  std::string etag_;
   std::string method_;
   std::string post_body_;
   int64 post_id_;