If a download is initiated by download attribute, don't use stream viewer

chrome/android/java/src/org/chromium/chrome/browser/download/ChromeDownloadDelegate.java

 // 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.
 
 package org.chromium.chrome.browser.download;
 
 import android.Manifest.permission;
 import android.app.Activity;
 import android.app.DownloadManager;
 import android.content.Context;
@@ skipping 131 matching lines @@
             @Override
             public void onDestroyed(Tab tab) {
                 mTab = null;
             }
         });
 
         mPendingRequest = null;
         mDangerousDownloadListener = new DangerousDownloadListener();
     }
 
-    /**
-     * Request a download from the given url, or if a streaming viewer is available stream the
-     * content into the viewer.
-     * @param downloadInfo Information about the download.
-     */
     @Override
-    public void requestHttpGetDownload(DownloadInfo downloadInfo) {
+    public void requestHttpGetDownload(DownloadInfo downloadInfo, boolean mustDownload) {
         // If we're dealing with A/V content that's not explicitly marked for download, check if it
         // is streamable.
-        if (!DownloadManagerService.isAttachment(downloadInfo.getContentDisposition())) {
+        if (!mustDownload) {
             // Query the package manager to see if there's a registered handler that matches.
             Intent intent = new Intent(Intent.ACTION_VIEW);
             intent.setDataAndType(Uri.parse(downloadInfo.getUrl()), downloadInfo.getMimeType());
             intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
             // If the intent is resolved to ourselves, we don't want to attempt to load the url
             // only to try and download it again.
             if (DownloadManagerService.openIntent(mContext, intent, false)) {
                 return;
             }
         }
@@ skipping 459 matching lines @@
     private static native String nativeGetDownloadWarningText(String filename);
     private static native boolean nativeIsDownloadDangerous(String filename);
     private static native void nativeDangerousDownloadValidated(
             Object tab, String downloadGuid, boolean accept);
     private static native void nativeLaunchDownloadOverwriteInfoBar(ChromeDownloadDelegate delegate,
             Tab tab, DownloadInfo downloadInfo, String fileName, String dirName,
             String dirFullPath);
     private static native void nativeLaunchPermissionUpdateInfoBar(
             Tab tab, String permission, long callbackId);
 }