No issue: add tools/setup-startup-profiling.py.

tools/setup-startup-profiling.py

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+#!/usr/bin/env python3
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+"""
+A script to set up startup profiling with the Firefox Profiler. See
+https://profiler.firefox.com/docs/#/./guide-remote-profiling?id=startup-profiling
+for more information.
+
+TODO: This script is a little janky and could be improved. For example, we
+should probably avoid having a separate config directory.
+"""
+
+import os
+import pathlib
+import sys
+from subprocess import run
+
+SCRIPT_NAME=os.path.basename(__file__)
+SCRIPT_DIR=pathlib.Path(__file__).parent.absolute()
+CONFIG_DIR=os.path.join(SCRIPT_DIR, 'startup-profiling-configs')
+
+PATH_PREFIX='/data/local/tmp'
+
+def print_usage_and_exit():
+    print('USAGE: ./{} [push|remove] <app-id>'.format(SCRIPT_NAME), file=sys.stderr)
+    print('example: ./{} push org.mozilla.fenix'.format(SCRIPT_NAME), file=sys.stderr)
+    sys.exit(1)
+
+def push(id, filename):
+    run(['adb', 'push', os.path.join(CONFIG_DIR, filename), PATH_PREFIX])
+    run(['adb', 'shell', 'am', 'set-debug-app', '--persistent', id])
+    print('Startup profiling enabled on all future start ups, possibly even after reinstall. Call script with `remove` to disable it.')
+
+def remove(filename):
+    run(['adb', 'shell', 'rm', PATH_PREFIX + '/' + filename])
+    run(['adb', 'shell', 'am', 'clear-debug-app'])
+
+try:
+    cmd = sys.argv[1]
+    id = sys.argv[2]
+except IndexError as e:
+    print_usage_and_exit()
+
+filename = id + '-geckoview-config.yaml'
+
+if cmd == 'push':
+    push(id, filename)
+elif cmd == 'remove':
+    remove(filename)
+else:
+    print_usage_and_exit()

tools/startup-profiling-configs/org.mozilla.fenix-geckoview-config.yaml

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+env:
+  MOZ_PROFILER_STARTUP: 1
+  MOZ_PROFILER_STARTUP_INTERVAL: 5
+  MOZ_PROFILER_STARTUP_FEATURES: threads,js,stackwalk,leaf,screenshots,ipcmessages,java
+  MOZ_PROFILER_STARTUP_FILTERS: GeckoMain,Compositor,Renderer,IPDL Background

tools/startup-profiling-configs/org.mozilla.fenix.debug-geckoview-config.yaml

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+env:
+  MOZ_PROFILER_STARTUP: 1
+  MOZ_PROFILER_STARTUP_INTERVAL: 5
+  MOZ_PROFILER_STARTUP_FEATURES: threads,js,stackwalk,leaf,screenshots,ipcmessages,java
+  MOZ_PROFILER_STARTUP_FILTERS: GeckoMain,Compositor,Renderer,IPDL Background

tools/startup-profiling-configs/org.mozilla.firefox-geckoview-config.yaml

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+env:
+  MOZ_PROFILER_STARTUP: 1
+  MOZ_PROFILER_STARTUP_INTERVAL: 5
+  MOZ_PROFILER_STARTUP_FEATURES: threads,js,stackwalk,leaf,screenshots,ipcmessages,java
+  MOZ_PROFILER_STARTUP_FILTERS: GeckoMain,Compositor,Renderer,IPDL Background

tools/startup-profiling-configs/org.mozilla.firefox_beta-geckoview-config.yaml

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+env:
+  MOZ_PROFILER_STARTUP: 1
+  MOZ_PROFILER_STARTUP_INTERVAL: 5
+  MOZ_PROFILER_STARTUP_FEATURES: threads,js,stackwalk,leaf,screenshots,ipcmessages,java
+  MOZ_PROFILER_STARTUP_FILTERS: GeckoMain,Compositor,Renderer,IPDL Background

tools/startup-profiling-configs/template

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+env:
+  MOZ_PROFILER_STARTUP: 1
+  MOZ_PROFILER_STARTUP_INTERVAL: 5
+  MOZ_PROFILER_STARTUP_FEATURES: threads,js,stackwalk,leaf,screenshots,ipcmessages,java
+  MOZ_PROFILER_STARTUP_FILTERS: GeckoMain,Compositor,Renderer,IPDL Background