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TabSearchUI is used for serving webui resources for tab search feature,
which will be checked in later. TabSearchPageHandler implements the
tab_search.mojom interface. The logic of this CL is mostly mimicking
TabStripUIHandler. Some code is moved from TabStripUIHandler to
chrome/browser/ui/webui/util/image_util.h to be able to used in
TabSearchPageHandler as well.

Bug: 1096120
Change-Id: I4668ad18ebb84282dc44d2dfb78916f54cd55abc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2242215
Commit-Queue: Yuheng Huang <yuhengh@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Reviewed-by: Matthew Denton <mpdenton@chromium.org>
Reviewed-by: John Lee <johntlee@chromium.org>
Reviewed-by: Thomas Lukaszewicz <tluk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781521}