Add a PDF component extension

chrome/browser/resources/pdf/background.js

+// Copyright (c) 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.
+
+chrome.streamsPrivate.onExecuteMimeTypeHandler.addListener(
+  function(mime_type, original_url, content_url, tab_id) {
+    // TODO(raymes): Currently this doesn't work with embedded PDFs (it
+    // causes the entire frame to navigate). Also work out how we can
+    // mask the URL with the URL of the PDF.
+    chrome.tabs.update(tab_id, { url: 'pdf.html?' + content_url });
+  }
+);