Add possibility to define data callback to BitmapFetcher

chrome/browser/bitmap_fetcher/bitmap_fetcher.h

Index: chrome/browser/bitmap_fetcher/bitmap_fetcher.h
diff --git a/chrome/browser/bitmap_fetcher/bitmap_fetcher.h b/chrome/browser/bitmap_fetcher/bitmap_fetcher.h
index 11055eaf61a50e8aaf7a051e629858c5435e7de5..a68a1c9122f28faf002dfb66c6aa389b1dd444ed 100644
--- a/chrome/browser/bitmap_fetcher/bitmap_fetcher.h
+++ b/chrome/browser/bitmap_fetcher/bitmap_fetcher.h
@@ -8,13 +8,13 @@
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/bitmap_fetcher/bitmap_fetcher_delegate.h"
 #include "chrome/browser/image_decoder.h"
+#include "net/url_request/url_fetcher.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"
 
 namespace net {
-class URLFetcher;
 class URLRequestContextGetter;
 }  // namespace net
 
@@ -41,6 +41,15 @@ class BitmapFetcher : public net::URLFetcherDelegate,
              net::URLRequest::ReferrerPolicy referrer_policy,
              int load_flags);
 
+  // Like BitmapFetcher::Start above but it allows to define user data key
+  // and create data callback for URLFetcher it creates.

[Theresa, 2015/04/22 23:07:06]

The phrasing here is a little unclear, maybe something like:

Like BitmapFetcher::Start above except it sets the |user_data_key| and
|create_data_callback| that are used when setting the user data on any URL
objects the fetcher creates.

+  void Start(net::URLRequestContextGetter* request_context,
+             const std::string& referrer,
+             net::URLRequest::ReferrerPolicy referrer_policy,
+             int load_flags,
+             const void* user_data_key,
+             const net::URLFetcher::CreateDataCallback& create_data_callback);
+
   // Methods inherited from URLFetcherDelegate
 
   // This will be called when the URL has been fetched, successfully or not.
@@ -68,6 +77,12 @@ class BitmapFetcher : public net::URLFetcherDelegate,
   // Alerts the delegate that a failure occurred.
   void ReportFailure();
 
+  scoped_ptr<net::URLFetcher> CreateURLFetcher(
+      net::URLRequestContextGetter* request_context,
+      const std::string& referrer,
+      net::URLRequest::ReferrerPolicy referrer_policy,
+      int load_flags);
+
   scoped_ptr<net::URLFetcher> url_fetcher_;
   const GURL url_;
   BitmapFetcherDelegate* const delegate_;