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This CL relands crrev.com/c/2248729 that got reverted due to breaking
Mac Builder (dbg) and others (power_monitor_device_source_unittest.cc
did not include logging.h and it couldn't find 'DVLOG'). The original
CL description only said "wip wip" o_O, which is sad.

Essentially this CL adds a GetCurrentThermalState() to PowerMonitor to
actively retrieve the current ThermalState. The ThermalState is sent to
PowerObservers, but newly created clients still need to query it at
least one time.

TBR=fdoray@chromium.org since the diff is just an include file.


Bug: 1071431
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2248729Reviewed-by: Henrik Boström <hbos@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781322}

Change-Id: Ia62ddfd8afc167473f3456e4982f51eaa52a833f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2261363Reviewed-by: Miguel Casas <mcasas@chromium.org>
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781678}