Support Extension Option Pages

[jonathansampson]

• Did you search for similar issues before submitting this one?
  Yes

• Describe the issue you encountered:
  Brave does not fully support Chrome-style option page settings.

• Platform (Win7, 8, 10? macOS? Linux distro?):
  Desktop

• Brave Version (revision SHA):
  8b8cf36

Needed Manifest Support:

• manifest.options_ui If not present, we should look for manifest.options_page.
• manifest.options_ui.page Required if options_ui is present.
• manifest.options_ui.chrome_style Recommended. Adds a user agent stylesheet to the content for consistent styling with the Browser itself.
• manifest.options_ui.open_in_tab Discouraged. Causes the options page to open in the deprecated manner.

Needed API Support:

• chrome.storage.sync Persists option settings across devices.
• chrome.runtime.openOptionsPage Navigates to manifest.options_ui.page || manifest.options_page. If the Options page is already opened, this will cause it to be re-focused.

Other Needed Support:

• Option pages should be accessible from within about:extensions.

• Any related documentation: https://developer.chrome.com/extensions/optionsV2

[bsclifton]

Moving to 0.14.3

[alexwykoff]

cc: @kevinlawler