src: Enable to type digit to commit emoji on lookup window
src: Enable to type digit to commit emoji on lookup window

Enables to commit an emoji on the lookup window by a digit key.
Before this patch, Ctrl-Shift-U, "11" shows emojis of 11 clock.
After this patch, Ctrl-Shift-U, "11" commits an emoji of 1 clock.
Probably Ctrl-Shift-U, "clock" can be a workaround.

BUG=rhbz#1380690
R=Shawn.P.Huang@gmail.com

Review URL: https://codereview.appspot.com/309640043

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