Use the previews black list for offline previews

chrome/browser/android/offline_pages/offline_page_request_interceptor.h

 // Copyright 2016 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_ANDROID_OFFLINE_PAGES_OFFLINE_PAGE_REQUEST_INTERCEPTOR_H_
 #define CHROME_BROWSER_ANDROID_OFFLINE_PAGES_OFFLINE_PAGE_REQUEST_INTERCEPTOR_H_
 
 #include "base/macros.h"
 #include "net/url_request/url_request_interceptor.h"
 
 namespace net {
 class NetworkDelegate;
 class URLRequest;
 class URLRequestJob;
 }
 
+namespace previews {
+class PreviewsDecider;
+}
+
 namespace offline_pages {
 
 // An interceptor to hijack requests and potentially service them based on
 // their offline information. Created one per profile.
 class OfflinePageRequestInterceptor : public net::URLRequestInterceptor {
  public:
-  OfflinePageRequestInterceptor();
+  // Embedder must guarantee that |previews_decider| outlives |this|.
+  explicit OfflinePageRequestInterceptor(
+      previews::PreviewsDecider* previews_decider);
   ~OfflinePageRequestInterceptor() override;
 
  private:
   // Overrides from net::URLRequestInterceptor:
   net::URLRequestJob* MaybeInterceptRequest(
       net::URLRequest* request,
       net::NetworkDelegate* network_delegate) const override;
 
+  // Used to determine if an URLRequest is eligible for offline previews.
+  previews::PreviewsDecider* previews_decider_;
+
   DISALLOW_COPY_AND_ASSIGN(OfflinePageRequestInterceptor);
 };
 
 }  // namespace offline_pages
 
 #endif // CHROME_BROWSER_ANDROID_OFFLINE_PAGES_OFFLINE_PAGE_REQUEST_INTERCEPTOR_H_