Add referrer & load flag support to BitmapFetcher class.

chrome/browser/bitmap_fetcher.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_BITMAP_FETCHER_H_
 #define CHROME_BROWSER_BITMAP_FETCHER_H_
 
 #include "base/memory/scoped_ptr.h"
 #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"
 
 namespace net {
 class URLFetcher;
 class URLRequestContextGetter;
 }  // namespace net
 
 namespace chrome {
 
 // Asynchrounously fetches an image from the given URL and returns the
 // decoded Bitmap to the provided BitmapFetcherDelegate.
 class BitmapFetcher : public net::URLFetcherDelegate,
                       public ImageDecoder::Delegate {
  public:
   BitmapFetcher(const GURL& url, BitmapFetcherDelegate* delegate);
   virtual ~BitmapFetcher();
 
   const GURL& url() const { return url_; }
 
   // 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.

[sky, 2014/05/06 15:24:20]

Better document what load_flags is. Specifically if I'm going to use this I
don't want to have to look else where for the common case.

[Kibeom Kim (inactive), 2014/05/06 18:07:14]

Done.

+  void Start(net::URLRequestContextGetter* request_context,
+             const std::string& referrer,
+             net::URLRequest::ReferrerPolicy referrer_policy,
+             int load_flags);
 
   // Methods inherited from URLFetcherDelegate
 
   // This will be called when the URL has been fetched, successfully or not.
   // Use accessor methods on |source| to get the results.
   virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
 
   // This will be called when some part of the response is read. |current|
   // denotes the number of bytes received up to the call, and |total| is the
   // expected total size of the response (or -1 if not determined).
@@ skipping 20 matching lines @@
   scoped_refptr<ImageDecoder> image_decoder_;
   const GURL url_;
   BitmapFetcherDelegate* const delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(BitmapFetcher);
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_BITMAP_FETCHER_H_