Add clear button directive

[mhartington]

From @brandyscarney on November 18, 2015 23:56

The searchbar has a clear button that shows when the user types, we could make a directive for this so the user could specify it within an ion-input and then it would automatically add the clear icon and clear the text when clicked.

Copied from original issue: driftyco/ionic2#586

[brandyscarney]

Exists as clearInput, issue created to fix the fact that the input can't be focused to click it: #6514

[msprasad9]

clearInput is working on Android devices. But On iPhone 6 with ios version 10.2.1 not clearing the text on clear button click. @mhartington @brandyscarney

[ionitron-bot]

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