Add Open my editor

tools/chrome_extensions/open_my_editor/ext/cr-content.js

+// Copyright 2017 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.
+
+// For codereview.chromium.org
+
+let clicked_element = null;
+
+document.addEventListener('mousedown', (event) => {
+  // right click
+  if (event.button == 2)
+    clicked_element = event.target;
+});
+
+chrome.runtime.onMessage.addListener((request, sender, sendResponse) => {
+  if (request == 'getFiles') {
+    let element = clicked_element;
+    while (element != null && element.tagName != 'TABLE')
+      element = element.parentElement;
+
+    let trs = element.getElementsByTagName('TR');
+    if (trs.length == 0)
+      alert('Please toggle one patchset.');
+
+    let files = [];
+    for (let i = 1; i < trs.length; ++i) {
+      let tr = trs[i];
+      if (tr.getAttribute('name') != 'patch')
+        continue;
+      // Skip deleted file.
+      if (tr.children[1].firstChild.data == 'D')
+        continue;
+
+      files.push(tr.children[2].children[0].text.replace(/\s*/g, ''));
+    }
+
+    sendResponse({files: files});
+  } else if (request == 'getFile' && clicked_element.tagName == 'A') {
+    sendResponse({file: clicked_element.text});
+  }
+});