We don't have an icon for the tap dragging setting, and settings screens
should either have icons for everything or nothing, so we decided to
remove all the icons. For all except ic_trackpad_touch_gestures_inverse,
they're only used in this one location, so the drawables can be removed
as well.
Screenshot: go/b-324058706-icon-removal-screenshot
Bug: 324058706
Test: with a touchpad connected, check that the System > Touchpad screen
has no icons on it.
Change-Id: I0c0a76c757f568cd20799c53a96cfb895ed00238
Screenshot: go/ag-26012379-screenshot
Bug: 321978150
Bug: 324058706
Test: with the flag disabled, check the new entry doesn't appear
Test: with the flag enabled, toggle the setting and check that it
enables and disables tap dragging (tapping then immediately putting
your finger back on the touchpad and moving it)
Test: with the flag enabled, check the setting appears in search results
Test: atest SettingsRoboTests:com.android.settings.inputmethod
Change-Id: Iccfbe842ff655ea295edc764cfc400709948df7d
Also fixes a bug in TrackpadTouchGestureSettings that used the wrong
preference ID for search indexing.
Bug: 300611520
Test: Verified on device
Flag: NA
Change-Id: I62ccf6d0b410be977f59f101edc5c42233d9474a
1. basic trackpad settings
2. trackpad gestures settgins
3. use feature flag to control gesture settings page.
Bug: 247080509
Test: local test
Change-Id: Ia7184eeb7670e5d807cb553929679972e54d8c92