commit e14a425e1518523f88eadf23d7dcf7b059a0e36b
author Mike Wasserman <msw@chromium.org> Mon May 23 18:18:17 2022
committer Chromium LUCI CQ <chromium-scoped@luci-project-accounts.iam.gserviceaccount.com> Mon May 23 18:18:17 2022
tree bcaa0d91503e488e3fb482f9e0fc94ff9f7d1ace
parent 208206b8012b36c20cb708c2ee2bb1e2f2f8f9c8

Window Placement: Prototype Fullscreen Capability Delegation - Part 2

This completes the prototype started in https://crrev.com/c/3575071

Support Fullscreen Capability Delegation when a flag is enabled:
  --enable-blink-features=CapabilityDelegationFullscreenRequest
Frames can delegate via messaging another frame on activation:
- w.postMessage(m, { targetOrigin: o, delegate: "fullscreen" });
Another frame can use the delegated capability on message receipt:
- window.onmessage = () => { e.requestFullscreen(); }

Activate a browser-side FullscreenRequestToken in:
- RFHI::PostMessageEvent for RemoteFrameHost's RouteMessageEvent
- new ReceivedDelegatedCapability for LocalFrameHost local messages

Focus windows that had delegation to request fullscreen, so:
- user can press [Esc] to exit fullscreen
- another focused window doesn't z-order above/below fullscreen

Add automated tests supporting feature flag and local/remote usage

(cherry picked from commit dbf43d9bce4a203ed01b1becb06f3f263fd9c4c3)

Bug: 1293083
Test: automated; Fullscreen Capability Delegation WAI with flag enabled
Change-Id: Ie46e627cd8df033016f16afbfda4075da81517b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3642842
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Reviewed-by: Mustaq Ahmed <mustaq@chromium.org>
Commit-Queue: Mike Wasserman <msw@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#1005525}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3658340
Auto-Submit: Mike Wasserman <msw@chromium.org>
Commit-Queue: Charlie Reis <creis@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/5060@{#187}
Cr-Branched-From: b83393d0f4038aeaf67f970a024d8101df7348d1-refs/heads/main@{#1002911}