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This moves the majority of AndroidBatteryMetrics from chrome/ to
components/, so that we can reuse it for WebView/WebLayer in the future.

The only aspect that remains in chrome/ is the detection of the app's
visibility state, since this will have to be done some other way for
WebView.

Bug: 1102048
Change-Id: Ia8391fd5efd80411ac970c559cdf5db988ba9ea4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2485794
Commit-Queue: Eric Seckler <eseckler@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819432}