* Propagate referrer to new windows
Fixes#9205
* Rearrange -new-window event arguments for backwards-compatibility
* Plumb referrer policy through guest-window-manager
* Document the Referrer structure and its uses
* Add tests for referrer in new windows
* Docs nits
* Remove the race condition between new process creation and old process releasing remote context
Previously there was a race condition where the getId() method would return the new context ID even
though the release was for the old context. This changes it to send the "initial" context ID with
the release message to ensure there is no race.
* fetch context ID from remote in sandbox mode
* Persist defaults to webPreferences object to JS land can read the inferred values instead of just user defined values
* Test inherited default propogation
* Refactor to remove coupling from fetching values and defaults
* Test description type
* Fix up tests
Right now, `<webview>` is the only way to embed additional content in a
`BrowserWindow`. Unfortunately `<webview>` suffers from a [number of
problems](https://github.com/electron/electron/issues?utf8=%E2%9C%93&q=is%3Aissue%20is%3Aopen%20label%3Awebview%20).
To make matters worse, many of these are upstream Chromium bugs instead
of Electron-specific bugs.
For us at [Figma](https://www.figma.com), the main issue is very slow
performance.
Despite the upstream improvements to `<webview>` through the OOPIF work, it is
probable that there will continue to be `<webview>`-specific bugs in the
future.
Therefore, this introduces a `<webview>` alternative to called `BrowserView`,
which...
- is a thin wrapper around `api::WebContents` (so bugs in `BrowserView` will
likely also be bugs in `BrowserWindow` web contents)
- is instantiated in the main process like `BrowserWindow` (and unlike
`<webview>`, which lives in the DOM of a `BrowserWindow` web contents)
- needs to be added to a `BrowserWindow` to display something on the screen
This implements the most basic API. The API is expected to evolve and change in
the near future and has consequently been marked as experimental. Please do not
use this API in production unless you are prepared to deal with breaking
changes.
In the future, we will want to change the API to support multiple
`BrowserView`s per window. We will also want to consider z-ordering
auto-resizing, and possibly even nested views.
