Adds support for sending a query via deep link.

To accomplish this, this CL:
- Adds some utility methods to deep_link_utils for parsing params.
- Moves parameter keys to a unified place within deep_link_utils.
- Uses API to unescape parameters.
- Adds support for query via deep link.

Bug: b:111654253
Change-Id: Ic09ded6c76393fdc56006594ff01e64e8753ed0f
Commit-Queue: David Black <>
Reviewed-by: Xiaohui Chen <>
Cr-Commit-Position: refs/heads/master@{#577776}
6 files changed