[Merge M137] Enable Chromium to connect to the payment app's DPU service

Before this patch, WebView connected to the Android payment app's DPU
(dynamic price update, a.k.a. payment details update) service, while
Chromium exposed a service for the Android payment app to connect to it
instead. WebView cannot expose its own service, so Android payment apps
that needed to work on both WebView and Chromium had to manage two
different ways to connect the same exact service.

This patch enables Chromium to connect to the Android payment app's DPU
service. This brings Chromium in line with the WebView implementation.

After this patch, Android payment apps can use a single implementation
for DPU service connection for both WebView and Chromium.

(cherry picked from commit 718dbd30472b8c170cbcf369432818f0233aa5f2)

Bug: 399419528
Fixed: 416540670
Change-Id: Ib8b2972f0c6820c04a6b3ab6bee0201b83cefd64
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6520092
Commit-Queue: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#1457054}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6528128
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Rouslan Solomakhin <rouslan@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/7151@{#603}
Cr-Branched-From: 8e0d32ed6e49a2415b16e5ed402957cac2349ce2-refs/heads/main@{#1453031}