Enable download page action for error page

chrome/browser/android/offline_pages/offline_page_bridge.cc

 // Copyright 2015 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/android/offline_pages/offline_page_bridge.h"
 
 #include <memory>
 #include <set>
 #include <string>
 #include <utility>
@@ skipping 492 matching lines @@
     JNIEnv* env,
     const base::android::JavaParamRef<jobject>& obj,
     const JavaParamRef<jobject>& j_web_contents) {
   content::WebContents* web_contents =
       content::WebContents::FromJavaWebContents(j_web_contents);
   if (!web_contents)
     return false;
   return offline_pages::OfflinePageUtils::IsShowingOfflinePreview(web_contents);
 }
 
+jboolean OfflinePageBridge::IsShowingDownloadButtonInErrorPage(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jobject>& obj,
+    const JavaParamRef<jobject>& j_web_contents) {
+  content::WebContents* web_contents =
+      content::WebContents::FromJavaWebContents(j_web_contents);
+  if (!web_contents)
+    return false;
+  return offline_pages::OfflinePageUtils::IsShowingDownloadButtonInErrorPage(
+      web_contents);
+}
+
 void OfflinePageBridge::GetRequestsInQueue(
     JNIEnv* env,
     const JavaParamRef<jobject>& obj,
     const JavaParamRef<jobject>& j_callback_obj) {
   ScopedJavaGlobalRef<jobject> j_callback_ref(j_callback_obj);
 
   RequestCoordinator* coordinator =
       offline_pages::RequestCoordinatorFactory::GetInstance()
           ->GetForBrowserContext(browser_context_);
 
@@ skipping 48 matching lines @@
       env, ConvertUTF8ToJavaString(env, client_id.name_space),
       ConvertUTF8ToJavaString(env, client_id.id));
 }
 
 bool RegisterOfflinePageBridge(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android
 }  // namespace offline_pages