base

Fix inline reply clobbering when narrowly missing send button

The RemoteInputView leaked through unhandled touches. To prevent this,
we now make sure the send button covers the entire area, and we catch
any touches that did not go to either the send button or the text box.

Bug: 27357771
Change-Id: Idc08d98dc7970b99c735f80088ea1eec0ec2d831