make buttons work in speedgrader in chrome
make buttons work in speedgrader in chrome

fixes CNVS-36093

Test Plan

1. Create a course with a teacher and two students.
2. Create and assignment for the course.
3. Open the assignment in SpeedGrader in a current version of Chrome.
4. Verify that buttons work.
  a. Left/Right arrows to navigate between students.
  b. Type a comment in the comment box and click submit
    1. Verify the comment is added.
  c. Click the gear icon and verify the options modal appears and is funcitonal.
  d. Click the keyboard shortcuts button and verify the corresponding modal displays.
  e. Click the mute assignment button and verify the modal displays.
  f. Add some text in the comment text box
    1. Click submit and verify comment is added.
  g. Click the attachment button.
    1. Verify you can add an attachment.
  h. Click the Speech recognition button.
   1. Verify you can add a comment via speech recognition.

Change-Id: I8910bba5de7d3342a993aa7f7858fe7e2901685e
Reviewed-on: https://gerrit.instructure.com/107903
Tested-by: Jenkins
Reviewed-by: Shahbaz Javeed <6692d7be3fa215e5483a121d6fb314def6049877@instructure.com>
Reviewed-by: Jeremy Neander <20252aad5efdc666f083d82ab63ed0f9f72a043e@instructure.com>
QA-Review: KC Naegle <9fbecd016338f9910821a8a5d5d0ae4fc9abfaa5@instructure.com>
Product-Review: Matt Fairbourn <5f353e1c97bb9cc046b9db20beca0b9392f6f1b2@instructure.com>

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