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Adds a default leading image to the omnibox to be used when
it's being focused (before the first update of the leading image).
There are two images: for the empty textfield (magnifying glass)
and the non-empty textfield (default favicon).

Bug: 865000
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ib9869c3b87f81041ec8a13b0ac220a3b93aa521e
Reviewed-on: https://chromium-review.googlesource.com/1146926Reviewed-by: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577877}