🔍 Don't display the search engine until First Run completes
* Adds a check to prevent showing branding if First Run hasn't completed.
* Updates the widget so that it is updated when an AsyncInitializationActivity
subclass calls onDeferredStartup().
* Changes the resource for the microphone to match the omnibox's, as well as
uses its content description.
* Adds tests to confirm that the search engine is updated once First Run
completes.
BUG=708844,710952
Review-Url: https://codereview.chromium.org/2834253002
Cr-Commit-Position: refs/heads/master@{#466839}
8 files changed
