tools/ime-test/index.html is a single-page input+textarea harness with an
on-page log timestamping focus/selection/input/composition events, paint
latency, long-tasks, and main-thread blocks — the instrumentation used to pin
the erase / caret-jump / first-letter-freeze bugs and what we'll use to profile
the magnifier. README documents serving it (python http.server on 8765,
10.0.2.2 for emulator / adb reverse for USB) and opening it as an embedded tab
via the in-app browser address bar. Plan gets a matching "How to test" section.
Dev tool only — nothing under tools/ ships, so the [ImeDiag] strings stay out of src/.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
