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MaximizeModeController::CanEnterMaximizeMode was based on receiving an accelerometer event. AccelerometerReader now sends an event to every observer as it is added, to reduce lag on receiving first event. However on devices without accelerometers this sends an empty event.

Updated MaximizeModeController to not set that accelerometer events have been seen until a valid event is received. One with actual data.

TEST=MaximizeModeControllerTest.CanEnterMaximizeModeRequiresValidAccelerometerUpdate
BUG=454662

Review URL: https://codereview.chromium.org/895993002

Cr-Commit-Position: refs/heads/master@{#315307}