* Overall build
* Enable nightly builds
* Enable Startup Profile generation for release builds
* Skip BP generation for regular Builds
* Test baseline profiles for all variants
* Cleanup
* Remove stale baseline-prof.txt
* Add generated profiles to .gitignore
* GMD
* Setup GMD in separate step
* Add GMD setup to all workflows
* Lower GMD specs
* Update GMD and Android SDK setup
* Add options test options for GMD startup
* Ensure only one device is used for bp / benchmark
* Apply guidance from issuetracker b/287312019
* Add new metrics for baseline profile measurement
Added custom metrics to better understand how effective a baseline
profile is. These TraceSectionMetrics keep track of JIT compilations
as well as class initializations which should go down when a BP is
properly applied to the app.