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Adds a suggested Siri shortcut 'Search in Chrome'.  As this is the
first Siri shortcut added, also adds some of the framework for
where to place the 'intentdefinition' file and localization.

SearchInChromeIntent.m/.h were generated natively within a sample
Xcode project.

Tbr: marq
No-try: true
Bug: 906693
Change-Id: Ib00b82d94af64ce0b2d8397b8cbd121d2b1345b2
Reviewed-on: https://chromium-review.googlesource.com/c/1351373
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611071}