Minimal IME with Handwriting support that can draw ink trail and commit
random text after each session.
Test: Manually
1. m -j HandwritingIme
2. adb install out/../HandwritingIme.apk
3. Simulate stylus with I7723be718354872509a9e85beda10acdbe25dd48
4. and enable the property in #3 with
adb shell setprop <property> true
5. Open any app with editor and swipe on EditText.
6. HW ink window with ink will appear.
Bug: 217957587
Change-Id: I53808ec261bd4364797b93d57cf6a8ddfd615390
