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ios__startup CI tests flake with "First frame is taking longer than expected..." #129836

@vashworth

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@vashworth

Tracking issues in CI when test times out due to getting stuck while waiting for first frame to render.

Tracing startup on iPhone.
stdout: [   +2 ms] Waiting for application to render first frame...
stdout: [+10010 ms] First frame is taking longer than expected...
stdout: [        ] View ID: _flutterView/0x13e033820
stdout: [  +20 ms] Isolate isolates/2513638347882587 state:
stdout: [   +5 ms] {"type":"Isolate","id":"isolates/2513638347882587","number":"2513638347882587","name":"main","isSystemIsolate":false,"isolateGroupId":"isolateGroups/12181116183114087429","isolateFlags":[{"name":"copy_parent_code","valueAsString":"false"},{"name":"is_system_isolate","valueAsString":"false"}],"startTime":1686070575944,"runnable":true,"livePorts":0,"pauseOnExit":false,"pauseEvent":{"type":"Event","kind":"Resume","timestamp":1686070575964,"isolate":{"type":"@Isolate","id":"isolates/2513638347882587","number":"2513638347882587","name":"main","isSystemIsolate":false,"isolateGroupId":"isolateGroups/12181116183114087429"}},"breakpoints":[],"exceptionPauseMode":"None","rootLib":{"type":"@Library","id":"libraries/@780382644","fixedId":true,"name":"","uri":"package:flutter_gallery/main.dart"},"extensionRPCs":["ext.ui.window.impellerEnabled","ext.dart.io.getHttpEnableTimelineLogging","ext.dart.io.setHttpEnableTimelineLogging","ext.dart.io.httpEnableTimelineLogging","ext.dart.io.getSocketProfile","ext.dart.io.startSocketProfiling","ext.dart.io.pauseSocketProfiling","ext.dart.io.socketProfilingEnabled","ext.dart.io.clearSocketProfile","ext.dart.io.getVersion","ext.dart.io.getHttpProfile","ext.dart.io.getHttpProfileRequest","ext.dart.io.clearHttpProfile","ext.flutter.exit","ext.flutter.connectedVmServiceUri","ext.flutter.activeDevToolsServerAddress","ext.flutter.timeDilation","ext.flutter.debugDumpRenderTree","ext.flutter.debugDumpSemanticsTreeInTraversalOrder","ext.flutter.debugDumpSemanticsTreeInInverseHitTestOrder","ext.flutter.profileRenderObjectPaints","ext.flutter.profileRenderObjectLayouts","ext.flutter.debugDumpApp","ext.flutter.debugDumpFocusTree","ext.flutter.showPerformanceOverlay","ext.flutter.didSendFirstFrameEvent","ext.flutter.didSendFirstFrameRasterizedEvent","ext.flutter.fastReassemble","ext.flutter.profileWidgetBuilds","ext.flutter.profileUserWidgetBuilds"]}
stdout: [        ] Received VM events:
stdout: [        ] Flutter.ServiceExtensionStateChanged: [ExtensionData {extension: ext.flutter.activeDevToolsServerAddress, value: http://127.0.0.1:9101/}]
stdout:            Flutter.ServiceExtensionStateChanged: [ExtensionData {extension: ext.flutter.connectedVmServiceUri, value: http://127.0.0.1:51213/JlruCfMkeJA=/}]

https://ci.chromium.org/ui/p/flutter/builders/prod/Mac_ios%20flutter_gallery_ios__start_up/11223/overview
https://ci.chromium.org/ui/p/flutter/builders/prod/Mac_ios%20flutter_view_ios__start_up/10786/overview

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P1High-priority issues at the top of the work listc: flakeTests that sometimes, but not always, incorrectly passplatform-iosiOS applications specificallyteam-iosOwned by iOS platform teamtriaged-iosTriaged by iOS platform team

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