Handle per-tab AUTOMATIC_DOWNLOADS setting in DownloadRequestLimiter.

chrome/browser/download/download_request_limiter.cc

 // Copyright (c) 2012 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 "chrome/browser/download/download_request_limiter.h"
 
 #include "base/bind.h"
 #include "base/stl_util.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/content_settings/host_content_settings_map_factory.h"
@@ skipping 173 matching lines @@
     ContentSetting setting) {
   if (!web_contents_)
     return;
   HostContentSettingsMap* settings =
       DownloadRequestLimiter::GetContentSettings(web_contents_);
   if (!settings)
     return;
   settings->SetContentSettingDefaultScope(
       web_contents_->GetURL(), GURL(),
       CONTENT_SETTINGS_TYPE_AUTOMATIC_DOWNLOADS, std::string(), setting);
+  TabSpecificContentSettings* tab_settings =
+      TabSpecificContentSettings::FromWebContents(web_contents_);
+  if (tab_settings) {

[alshabalin, 2016/12/08 11:39:06]

This is called right after permission prompt decision. Calls to
TabSpecificContentSettings::SetDownloadsBlocked will trigger notification to
DownloadRequestLimiter::TabDownloadState::Observe which will change status_.
However, it would be changed again anyway by call to NotifyCallbacks (from
Cancel() and Accept()).

+    switch (setting) {
+      case CONTENT_SETTING_BLOCK:
+        tab_settings->SetDownloadsBlocked(true);
+        break;
+      case CONTENT_SETTING_ALLOW:
+        tab_settings->SetDownloadsBlocked(false);
+        break;
+      default:
+        // Nothing to do.
+        break;
+    }
+  }
 }
 
 void DownloadRequestLimiter::TabDownloadState::Cancel() {
   SetContentSetting(CONTENT_SETTING_BLOCK);
   NotifyCallbacks(false);
 }
 
 void DownloadRequestLimiter::TabDownloadState::CancelOnce() {
   NotifyCallbacks(false);
 }
@@ skipping 262 matching lines @@
       NOTREACHED();
   }
 }
 
 void DownloadRequestLimiter::Remove(TabDownloadState* state,
                                     content::WebContents* contents) {
   DCHECK(base::ContainsKey(state_map_, contents));
   state_map_.erase(contents);
   delete state;
 }