Add clear all view that scales off device height

Add a custom clear all view that scales its height based off the height
of the device in portrait. This view holds and lays out the actual
button.

Bug: 114136250
Test: Task items + clear all scale to fit flush with screen size
Change-Id: I72b175681c104588970d57cde34cebc0f06b55a0
(cherry picked from commit a2b8ca88)