Make context menu dialog title scrollable for alt-text.

chrome/android/java/src/org/chromium/chrome/browser/contextmenu/ChromeContextMenuPopulator.java

 // Copyright 2013 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.contextmenu;
 
 import android.content.Context;
 import android.net.MailTo;
 import android.text.TextUtils;
 import android.view.ContextMenu;
@@ skipping 26 matching lines @@
     public boolean shouldShowContextMenu(ContextMenuParams params) {
         return params != null && (params.isAnchor() || params.isEditable() || params.isImage()
                 || params.isSelectedText() || params.isVideo());
     }
 
     @Override
     public void buildContextMenu(ContextMenu menu, Context context, ContextMenuParams params) {
         if (!TextUtils.isEmpty(params.getLinkUrl()) && !params.getLinkUrl().equals(BLANK_URL)) {
             menu.setHeaderTitle(params.getLinkUrl());
         } else if (!TextUtils.isEmpty(params.getTitleText())) {
-            menu.setHeaderTitle(params.getTitleText());
+            ContextMenuTitleView title = new ContextMenuTitleView(context, params.getTitleText());
+            menu.setHeaderView(title);
         }
 
         if (mMenuInflater == null) mMenuInflater = new MenuInflater(context);
 
         mMenuInflater.inflate(R.menu.chrome_context_menu, menu);
 
         menu.setGroupVisible(R.id.contextmenu_group_anchor, params.isAnchor());
         menu.setGroupVisible(R.id.contextmenu_group_image, params.isImage());
         menu.setGroupVisible(R.id.contextmenu_group_video, params.isVideo());
 
@@ skipping 97 matching lines @@
             mDelegate.onSaveImageToClipboard(params.getSrcUrl());
         } else if (itemId == R.id.contextmenu_copy_image_url) {
             mDelegate.onSaveToClipboard(params.getSrcUrl(), true);
         } else {
             assert false;
         }
 
         return true;
     }
 }