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This CL does the following:
1. Updates infobar java code to assign a priority number to each
infobar, and high priority infobar is shown in front of low priority
infobar. If infobars have the same priorities, the most recently
added one is shown behind previous ones.
2. Update the SMS infobar to have USER_TRIGGERED priority.

Bug: 999222
Change-Id: I8f2b3ccb45dd8a6ec97ed4f0b246ac69ae60c7c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1783720
Commit-Queue: Jun Cai <juncai@chromium.org>
Reviewed-by: Ayu Ishii <ayui@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693863}