Handle online and offline redirects via interceptor and offline scheme

chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc

Index: chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
diff --git a/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc b/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
index acad9e3266c333347c73f456e5a8d806d39d74dc..855d04c94a611efdf638b8bf25d5c1e4a4c71743 100644
--- a/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
+++ b/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
@@ -100,6 +100,7 @@
 
 #if BUILDFLAG(ANDROID_JAVA_UI)
 #include "chrome/browser/android/intercept_download_resource_throttle.h"
+#include "chrome/browser/android/offline_pages/offline_page_request_handler.h"
 #endif
 
 #if defined(OS_ANDROID)
@@ -387,6 +388,14 @@ bool ChromeResourceDispatcherHostDelegate::ShouldBeginRequest(
     }
   }
 
+#if defined(OS_ANDROID)
+  // Offline URL cannot be loaded as non-main resource.
+  if (resource_type != content::RESOURCE_TYPE_MAIN_FRAME &&
+      url.SchemeIs(chrome::kOfflinePageScheme)) {
+    return false;
+  }
+#endif
+
   return true;
 }
 
@@ -472,6 +481,11 @@ void ChromeResourceDispatcherHostDelegate::RequestBeginning(
     io_data->resource_prefetch_predictor_observer()->OnRequestStarted(
         request, resource_type, info->GetChildID(), info->GetRenderFrameID());
   }
+
+#if defined(OS_ANDROID)
+  offline_pages::OfflinePageRequestHandler::InitializeHandler(
+      request, resource_type);
+#endif
 }
 
 void ChromeResourceDispatcherHostDelegate::DownloadStarting(