Add referrer & load flag support to BitmapFetcher class.

chrome/browser/bitmap_fetcher.h

Index: chrome/browser/bitmap_fetcher.h
diff --git a/chrome/browser/bitmap_fetcher.h b/chrome/browser/bitmap_fetcher.h
index b468c038b8dc0162a32d1146d7da0fd2c545dfe6..e53108475373ac0daab4fc8e883567856c577c6c 100644
--- a/chrome/browser/bitmap_fetcher.h
+++ b/chrome/browser/bitmap_fetcher.h
@@ -9,6 +9,7 @@
 #include "chrome/browser/bitmap_fetcher_delegate.h"
 #include "chrome/browser/image_decoder.h"
 #include "net/url_request/url_fetcher_delegate.h"
+#include "net/url_request/url_request.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "url/gurl.h"
 
@@ -32,8 +33,13 @@ class BitmapFetcher : public net::URLFetcherDelegate,
   // Start fetching the URL with the fetcher. The delegate is notified
   // asynchronously when done.  Start may be called more than once in some
   // cases.  If so, subsequent starts will be ignored since the operation is
-  // already in progress.
-  void Start(net::URLRequestContextGetter* request_context);
+  // already in progress.  Arguments are used to configure the internal fetcher.
+  // Values for |load_flags| are defined in net/base/load_flags.h.  In general,
+  // |net::LOAD_NORMAL| is appropriate.
+  void Start(net::URLRequestContextGetter* request_context,
+             const std::string& referrer,
+             net::URLRequest::ReferrerPolicy referrer_policy,
+             int load_flags);
 
   // Methods inherited from URLFetcherDelegate