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This is a reland of 2c942cf7
Revert is at https://crrev.com/c/2545724

Original change's description:
> [DevTools] Introduce `Page.DocumentOpened` CDP event
>
> Send a `Page.DocumentOpened` event via CDP when an iframe's content is
> edited via JS. Writing to an iframe's document via JS is not considered
> a navigation, therefore no `Page.Navigated` CDP event is emitted. But
> since writing to an iframe's document can change attributes which
> DevTools needs to be informed about, the `Page.DocumentOpened` event is
> emitted instead. Previously only a refresh of DevTools would let
> DevTools know about changes to an iframe caused by JS manipulation of
> said iframe.
>
> Example (see http://doc/1gczarAME7AATGHwqm_IDqcGFlOM6DLAoX9rqetv4Rx0):
> There is a 'frameNavigated' event for the initial load of an iframe.
> If there is a 'document.write' for this iframe right away, there is no
> 'frameNavigated' event for this iframe at all.
>
> Frontend CL: https://crrev.com/c/2507793
> (needs to be merged first, this will fix the failing tests, which fail
> because the frontend cannot handle unknown CDP events)
>
> Bug: chromium:1140540, chromium:1140481
>
>
> Change-Id: I92a659b7ab8b1cb7ae50e28df40b8ca9b0bf8c86
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2498482
> Commit-Queue: Daniel Cheng <dcheng@chromium.org>
> Auto-Submit: Wolfgang Beyer <wolfi@chromium.org>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
> Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#828122}

Bug: chromium:1140540
Bug: chromium:1140481
Change-Id: I4fce7b9511e61e15a52c11971ea9be7560da2e55
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2545011Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Wolfgang Beyer <wolfi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829241}