Tests stability of performance metrics list.


Metrics reported:
AdSubframes
ArrayBufferContents
AudioHandlers
AudioWorkletProcessors
ContextLifecycleStateObservers
DetachedScriptStates
DevToolsCommandDuration
Documents
DomContentLoaded
FirstMeaningfulPaint
Frames
JSEventListeners
JSHeapTotalSize
JSHeapUsedSize
LayoutCount
LayoutDuration
LayoutObjects
MediaKeySessions
MediaKeys
NavigationStart
Nodes
ProcessTime
RTCPeerConnections
RecalcStyleCount
RecalcStyleDuration
ResourceFetchers
Resources
ScriptDuration
TaskDuration
TaskOtherDuration
ThreadTime
Timestamp
UACSSResources
V8CompileDuration
V8PerContextDatas
WorkerGlobalScopes