With this CL,
InputMethodManager#showInputMethodAndSubtypeEnabler()
is fully implemented in the client side. By not using system_server
privileged context to launch the Settings activity, we can stop
worrying about conflicts with existing security concepts such as
* Background Activity launch blocking mechanism
* Restrictions for instant apps
Bug: 34886274
Test: Manually verified as follows.
1. Build aosp_coral-userdebug and flash it.
2. adb install -r $ANDROID_TARGET_OUT_TESTCASES/ApiDemos/arm64/ApiDemos.apk
3. adb shell am start -n com.example.android.apis/.ApiDemos
4. View -> Input Method -> ShowInputMethodAndSubtypeEnabler
5. Verify that the API works.
Change-Id: I5199ca4609c03900a0e86011d344b054b1df08dd
ea675ead0a