Augury should save the dark theme settings

[sumitarora]

This is an issue especially good for first-timers!

🐞 The Problem

This issue is related to #420.
We would like the user to be able to persist their theme setting for Augury.
The relevant code snippet from src/frontend/frontend.ts

  themeChanged(newTheme) {
    this.theme = newTheme;
    // TODO: do stuff here to persist the theme selection
  }

📖 What you need to know

Angular 2, typescript. Probably relevant resources:

• Chrome Storage
• Events in Angular 2

🔂 Steps to contribute

• claim this issue: (assign yourself or comment below) claimed by @JayKan 👏
• mentor: @vanessayuenn
• Setup & run Augury locally
• Implement the fix
• Write the tests for the solution
• Start a Pull Request. Mention this issue in the description (e.g. resolves #423).

💖 Thank you!

Thanks so much for wanting to contribute! This issue is especially perfect for first time contributor. Please contact us on Slack if you have any questions. :)

[JayKan]

I would like to tackle this issue :)

[vanessayuenn]

@JayKan all yours! check off the boxes as you go :)