WebView Prerender: Defer WebMessage from JS to browser until activation

postMessage() from JS to Java during prerendering should be deferred
until prerender activation. This CL implements the logic on the
components/js_injection/ layer.

Messages should be queued until a page gets activated or an associated
document is swapped out, while JsToBrowserMessaging that manages
(queued) posted messages is a per-RenderFrameHost object that can be
reused over cross-document navigation. To address this incompatibility,
this CL manages the messages using DocumentUserData.

To test this deferral logic, this CL moves TestWebMessageListener from
JsJavaInteractionTest.java to its own file so that AwPrerenderTest.java
can reuse the listener.

Design doc (Google internal only):
https://docs.google.com/document/d/1jIoS5pko1NGp1rRQx3dEm4StY1L8xT8CapqcDzB7Tv8/edit?usp=sharing

Credit: Changes in the components/js_injection/ layer were originally
written by kouhei@chromium.org.

Bug: 41490450, 331592024
Change-Id: I1a1a9d96faff041eba36ac560ffcdbdf556e9094
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5385248


Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Reviewed-by: Richard (Torne) Coles <torne@chromium.org>
Reviewed-by: Rakina Zata Amni <rakina@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1280563}