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On ChromeOS, PowerMonitorDeviceSource::GetCurrentThermalState will
always return PowerObserver::DeviceThermalState::kUnknown now, because
PowerManagerClientImpl will miss the first thermal event sent by the
Thermal Hinting API when constructed and there isn't a cache of the
last state.

In this CL, the GetCurrentThermalState is implemented for ChromeOS using
GetThermalState API added by
https://chromium-review.googlesource.com/c/chromiumos/platform2/+/2495080

BUG=chromium:1081959
TEST=Manually test in chrome://device-log to see if there's
"GetThermalState" response after startup.

Change-Id: I9bbf5416b0ba76a015a08d2d4c91ea732704a541
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2498240
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830944}