Tests that overriding CPU performance tier changes the navigator property
Match after setting tier, run 1: true
Match after setting tier, run 1 after reload: true
Match after setting tier, run 2: true
Match after setting tier, run 2 after reload: true
Match after setting tier, run 3: true
Match after setting tier, run 3 after reload: true
Match after setting tier, run 4: true
Match after setting tier, run 4 after reload: true
Failed to set invalid tier bogus: Invalid performanceTier enum value
Match after setting invalid tier bogus: true
Match after clearing tier: true
Match in iframe after initial override: true
Match in iframe after changing override: true