Make select-to-speak work with Google Docs.

chrome/browser/resources/chromeos/select_to_speak/select_to_speak_gdocs_script.js

Index: chrome/browser/resources/chromeos/select_to_speak/select_to_speak_gdocs_script.js
diff --git a/chrome/browser/resources/chromeos/select_to_speak/select_to_speak_gdocs_script.js b/chrome/browser/resources/chromeos/select_to_speak/select_to_speak_gdocs_script.js
new file mode 100644
index 0000000000000000000000000000000000000000..144c53f4feaf93e93bac0dea330e9c5512440b9a
--- /dev/null
+++ b/chrome/browser/resources/chromeos/select_to_speak/select_to_speak_gdocs_script.js
@@ -0,0 +1,24 @@
+// 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.
+
+var tries = 10;
+
+// Google Docs isn't compatible with Select-to-speak by default because
+// in order to provide screen reader support, most of the rendered
+// document has aria-hidden set on it, which has the side effect of
+// hiding it from Select-to-speak too. Fix it by changing aria-hidden
+// to false. Try multiple times in case the page isn't fully loaded when
+// the content script runs.
+function RemoveAriaHiddenFromGoogleDocsContent() {
+  var element = document.querySelector('.kix-zoomdocumentplugin-outer');
+  if (element) {
+    element.setAttribute('aria-hidden', 'false');
+  } else {
+    tries--;
+    if (tries > 0)
+      window.setTimeout(RemoveAriaHiddenFromGoogleDocsContent, 1000);
+  }
+}
+
+RemoveAriaHiddenFromGoogleDocsContent();