Add TTID (Time To Initial Display) instrumentation - #1864
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Adds an AppStartDisplay span, a child of AppStart, that measures time to first frame drawn on cold start using the Choreographer double-postFrameCallback technique.
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Summary
AppStartDisplayspan (child of the existingAppStartspan) measuring Time To Initial Display (TTID) — the time from app start until the first frame is drawn after the initial activity resumes.Choreographer.postFrameCallbacktechnique to avoid reporting an already-in-flight stale frame.uninstall().Test plan
./gradlew :instrumentation:activity:testDebugUnitTestlocallyAppStartDisplayappears with a plausible small positive duration relative toAppStart