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Added the SearchField component to the TabSearch WebUI.

The search field adheres to current UX style specifications for
Read Later and Tab Search features.

Dependent CL (update to Polymer bundle):
  https://crrev.com/c/2324810

Before:
  https://drive.google.com/file/d/1A_ikRVaaqhYH1k9RXSnH1aWWknAwajZF

After:
  https://drive.google.com/file/d/1rN_-548iNgbWDvlVH9l_CZQXgydRtgyc

Bug: 1099917
Change-Id: Id92c573aee7463e626773ff514a1b50d3ee18648
Reviewed-on: https://chrome-internal-review.googlesource.com/c/chrome/browser/resources/tab_search/+/3177409Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Roman Arora <romanarora@chromium.org>
Reviewed-by: John Lee <johntlee@chromium.org>
Reviewed-by: Yuheng Huang <yuhengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819573}