The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/627ab487f2c43ca1721935cc4c4579ef9eff421d

commit 627ab487f2c43ca1721935cc4c4579ef9eff421d
Author: michaeldo <michaeldo@chromium.org>
Date: Tue Feb 28 07:20:28 2017

Add JavaScript prompts support to CWVUIDelegate.

BUG= 696630 

Review-Url: https://codereview.chromium.org/2715343002
Cr-Commit-Position: refs/heads/master@{#453536}

[modify] https://crrev.com/627ab487f2c43ca1721935cc4c4579ef9eff421d/ios/web_view/internal/BUILD.gn
[modify] https://crrev.com/627ab487f2c43ca1721935cc4c4579ef9eff421d/ios/web_view/internal/cwv_web_view.mm
[add] https://crrev.com/627ab487f2c43ca1721935cc4c4579ef9eff421d/ios/web_view/internal/web_view_java_script_dialog_presenter.h
[add] https://crrev.com/627ab487f2c43ca1721935cc4c4579ef9eff421d/ios/web_view/internal/web_view_java_script_dialog_presenter.mm
[modify] https://crrev.com/627ab487f2c43ca1721935cc4c4579ef9eff421d/ios/web_view/public/cwv_ui_delegate.h
[modify] https://crrev.com/627ab487f2c43ca1721935cc4c4579ef9eff421d/ios/web_view/shell/shell_view_controller.h
[modify] https://crrev.com/627ab487f2c43ca1721935cc4c4579ef9eff421d/ios/web_view/shell/shell_view_controller.m