Add referrer & load flag support to BitmapFetcher class.

content/public/common/referrer.cc

+// 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.
+#include "content/public/common/referrer.h"
+
+#include <string>
+
+#include "base/command_line.h"
+#include "base/logging.h"
+#include "content/public/common/content_switches.h"
+
+namespace {
+
+GURL ReferrerForHeader(const GURL& referrer) {

[Kibeom Kim (inactive), 2014/04/30 00:58:56]

From ios/web/public/referrer_util.cc .

https://chrome-internal.googlesource.com/bling/chromium/+/master/ios/web/publ...

More context:
https://chromereviews.googleplex.com/6891014
https://chromereviews.googleplex.com/6908014

+  DCHECK(referrer.is_valid());
+  GURL::Replacements replacements;
+  replacements.ClearUsername();
+  replacements.ClearPassword();
+  replacements.ClearRef();
+  return referrer.ReplaceComponents(replacements);
+}
+
+}  // namespace
+
+namespace content {
+
+GURL Referrer::ReferrerHeaderUrlForNavigation(const GURL& destination) const {
+  GURL referrer_url;
+
+  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kNoReferrers))
+    return referrer_url;
+
+  // Make sure that we're covering all the cases.
+  DCHECK(blink::WebReferrerPolicyLast == 3);
+
+  switch (policy) {
+    case blink::WebReferrerPolicyDefault:
+      if (url.SchemeIsSecure() && !destination.SchemeIsSecure())
+        break;
+    // Purposeful fall through.
+    case blink::WebReferrerPolicyAlways:
+      referrer_url = ReferrerForHeader(url);
+      break;
+    case blink::WebReferrerPolicyOrigin:
+      referrer_url = url.GetOrigin();
+      break;
+    case blink::WebReferrerPolicyNever:
+      break;
+    default:
+      NOTREACHED();
+  }
+
+  return referrer_url;
+}
+
+}  // namespace content