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This is the third part in a series of CLs for moving the
AddToHomescreen component to MVC in Android.

In this CL the AddToHomescreenInstaller and
AddToHomescreenParams classes are added.
AppBannerUiDelegateAndroid and AddToHomescreenManager classes are
edited to use these new classes.

Design doc: http://go/a2hs-mvc

A subsequient CL will implement the coordinator and the mediator classes
and remove the AppBannerUiDelegateAndroid and AddToHomescreenManager
classes.

Bug: 994759
Change-Id: Iaaa0b714d4aac9c3d348348a972b937bdaa246c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1864568
Auto-Submit: Mehran Mahmoudi <mahmoudi@chromium.org>
Reviewed-by: Peter Kotwicz <pkotwicz@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Commit-Queue: Mehran Mahmoudi <mahmoudi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711258}