Add possibility to define data callback to BitmapFetcher

chrome/browser/bitmap_fetcher/bitmap_fetcher.cc

Index: chrome/browser/bitmap_fetcher/bitmap_fetcher.cc
diff --git a/chrome/browser/bitmap_fetcher/bitmap_fetcher.cc b/chrome/browser/bitmap_fetcher/bitmap_fetcher.cc
index e413fa1a8e35de6643623c4434156ea5de9f9941..76d24cc89b20f0acf0988c435de53d695d99d204 100644
--- a/chrome/browser/bitmap_fetcher/bitmap_fetcher.cc
+++ b/chrome/browser/bitmap_fetcher/bitmap_fetcher.cc
@@ -21,10 +21,10 @@ BitmapFetcher::BitmapFetcher(const GURL& url, BitmapFetcherDelegate* delegate)
 BitmapFetcher::~BitmapFetcher() {
 }
 
-void BitmapFetcher::Start(net::URLRequestContextGetter* request_context,
-                          const std::string& referrer,
-                          net::URLRequest::ReferrerPolicy referrer_policy,
-                          int load_flags) {
+void BitmapFetcher::Init(net::URLRequestContextGetter* request_context,
+                         const std::string& referrer,
+                         net::URLRequest::ReferrerPolicy referrer_policy,
+                         int load_flags) {
   if (url_fetcher_ != NULL)
     return;
 
@@ -33,6 +33,9 @@ void BitmapFetcher::Start(net::URLRequestContextGetter* request_context,
   url_fetcher_->SetReferrer(referrer);
   url_fetcher_->SetReferrerPolicy(referrer_policy);
   url_fetcher_->SetLoadFlags(load_flags);
+}
+
+void BitmapFetcher::Start() {
   url_fetcher_->Start();
 }