[Android Downloads] Long-press menu item "Download Link" should delegate job to OfflinePages backen…

chrome/browser/loader/chrome_resource_dispatcher_host_delegate.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/loader/chrome_resource_dispatcher_host_delegate.h"
 
 #include <stdint.h>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 90 matching lines @@
 #include <google/protobuf/repeated_field.h>
 #else
 #include "third_party/protobuf/src/google/protobuf/repeated_field.h"
 #endif
 
 #if defined(OS_ANDROID)
 #include "chrome/browser/loader/data_reduction_proxy_resource_throttle_android.h"
 #include "components/navigation_interception/intercept_navigation_delegate.h"
 #endif
 
+#if BUILDFLAG(ANDROID_JAVA_UI)
+#include "chrome/browser/android/offline_pages/downloads/resource_throttle.h"
+#endif
+
 #if defined(OS_CHROMEOS)
 #include "chrome/browser/chromeos/login/signin/merge_session_resource_throttle.h"
 #include "chrome/browser/chromeos/login/signin/merge_session_throttling_utils.h"
 #endif
 
 using content::BrowserThread;
 using content::RenderViewHost;
 using content::ResourceDispatcherHostLoginDelegate;
 using content::ResourceRequestInfo;
 using content::ResourceType;
@@ skipping 417 matching lines @@
         request->url(), request->method()));
   }
 
   // If this isn't a new request, the standard resource throttles have already
   // been added, so no need to add them again.
   if (is_new_request) {
     AppendStandardResourceThrottles(request,
                                     resource_context,
                                     content::RESOURCE_TYPE_MAIN_FRAME,
                                     throttles);
+#if BUILDFLAG(ANDROID_JAVA_UI)
+    // On Android, forward text/html downloads to OfflinePages backend.
+    throttles->push_back(
+        new offline_pages::downloads::ResourceThrottle(request));
+#endif
   }
 }
 
 ResourceDispatcherHostLoginDelegate*
     ChromeResourceDispatcherHostDelegate::CreateLoginDelegate(
         net::AuthChallengeInfo* auth_info, net::URLRequest* request) {
   return CreateLoginPrompt(auth_info, request);
 }
 
 bool ChromeResourceDispatcherHostDelegate::HandleExternalProtocol(
@@ skipping 330 matching lines @@
           base::Bind(&ChromeResourceDispatcherHostDelegate::OnAbortedFrameLoad,
                     base::Unretained(this), url, request_loading_time));
       return;
   }
 
   std::string metric_name = (request_loading_time.InMilliseconds() < 100 ?
       "Net.ErrAborted.Fast" : "Net.ErrAborted.Slow");
   rappor::SampleDomainAndRegistryFromGURL(
       g_browser_process->rappor_service(), metric_name, url);
 }