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Devtools is adding functionality to do in-product surveys via a
non-public API. This CL adds the ability for the chrome-internal
repository to set an API key that gets piped through to devtools.

The API key is added to google_api_keys in the same way that other API
keys are handled, meaning it can be locally overridden, although there
is not much point to actually doing this because the API itself is not
public.

This CL adds a new method 'getSurveyAPIKey' to the InspectorFrontendHost
API which the devtools frontend uses to communicate with chrome.

The corresponding frontend CL is http://crrev.com/c/2361683/

Doc: https://docs.google.com/document/d/1wMRb1hI2zJ1mzOSJjjF46C2hToGksQf2AxurorxaiTg/edit#heading=h.jc7x7daf69yo

Bug: 1112738
Change-Id: Ic3d9d436556f06b8ff8fb3593e4ed40d68ed3507
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2362182Reviewed-by: Simon Zünd <szuend@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807027}