multi-instance: Close the dialog on touch outside

Modal dialog has a bug letting users interact with the back contents.
in split-screen mode. This CL sets a new property for multi-instance
dialog so that a touch outside the dialog dismisses it. It allows the
UI to work like that of most of other features. The issue in the split-
screen mode itself will be addressed separately.

Bug: 1246958
Change-Id: I7096bf3d52695f0b58b03c715172d51c476c8aa1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3142704
Reviewed-by: Theresa  <[email protected]>
Commit-Queue: Theresa  <[email protected]>
Cr-Commit-Position: refs/heads/main@{#918844}

Author: JinsukKim

chrome/browser/ui/android/multiwindow/java/src/org/chromium/chrome/browser/multiwindow/InstanceSwitcherCoordinator.java

@@ -159,6 +159,7 @@ public void onClick(PropertyModel model, int buttonType) {
         String title = resources.getString(R.string.instance_switcher_header);
         return new PropertyModel.Builder(ModalDialogProperties.ALL_KEYS)
                 .with(ModalDialogProperties.CONTROLLER, controller)
+                .with(ModalDialogProperties.CANCEL_ON_TOUCH_OUTSIDE, true)
                 .with(ModalDialogProperties.CUSTOM_VIEW, dialogView)
                 .with(ModalDialogProperties.TITLE, title)
                 .with(ModalDialogProperties.POSITIVE_BUTTON_TEXT, resources, R.string.cancel)

chrome/browser/ui/android/multiwindow/java/src/org/chromium/chrome/browser/multiwindow/TargetSelectorCoordinator.java

@@ -110,6 +110,7 @@ public void onClick(PropertyModel model, int buttonType) {
         String title = mContext.getString(R.string.menu_move_to_other_window);
         return new PropertyModel.Builder(ModalDialogProperties.ALL_KEYS)
                 .with(ModalDialogProperties.CONTROLLER, controller)
+                .with(ModalDialogProperties.CANCEL_ON_TOUCH_OUTSIDE, true)
                 .with(ModalDialogProperties.CUSTOM_VIEW, mDialogView)
                 .with(ModalDialogProperties.TITLE, title)
                 .with(ModalDialogProperties.POSITIVE_BUTTON_DISABLED, true)