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Tags the web contents created in the WebUIBubbleManager so that the
specified label shows up in the task manager.

Screenshot: https://drive.google.com/file/d/1cql788sSWWh2aRYrB05-IayXZUVGAzWP/view
See 'Tool: Search Tabs'

Bug: 1151373
Change-Id: Ibbef901623a0bb31a6c2e36eca6dcd13c1327e15
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2587624Reviewed-by: Caroline Rising <corising@chromium.org>
Reviewed-by: Thomas Lukaszewicz <tluk@chromium.org>
Commit-Queue: Roman Arora <romanarora@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837798}