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This patch adds the Settings to launcher apps grid.
1. Added class InternalAppItem.
2. Added class InternalAppModelBuilder.

Bug: 824437
Test: InternalAppModelBuilderTest.Build
Change-Id: I0dd06e767527b73e7ed14ca4dbab3e26d5c6e075
Reviewed-on: https://chromium-review.googlesource.com/1007496Reviewed-by: Nicolas Zea <zea@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Tao Wu <wutao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550679}