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This CL refactors SmsDialog to use event handler. An enum SmsDialogEvent
is added to SmsDialog class and can be used by both C++ and Java code.

Bug: 985441
Change-Id: I1ecc4e70609479124c80a7166a9551ffa77566a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1737875
Commit-Queue: Jun Cai <juncai@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Ayu Ishii <ayui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686524}