Chromium already includes the necessary plumbing to manage the
visibility properties and `visibilitychange` event so this gets rid of
most of our custom logic for `BrowserWindow` and `BrowserView`.
Note that `webview` remains unchanged and is still affected by the issues
listed below.
User facing changes:
- The `document` visibility properties and `visibilitychange` event are
now also updated/fired in response to occlusion changes on macOS. In
other words, `document.visibilityState` will now be `hidden` on macOS
if the window is occluded by another window.
- Previously, `visibilitychange` was also fired by *both* Electron and
Chromium in some cases (e.g. when hiding the window). Now it is only
fired by Chromium so you no longer get duplicate events.
- The visiblity state of `BrowserWindow`s created with `{ show: false }`
is now initially `visible` until the window is shown and hidden.
- The visibility state of `BrowserWindow`s with `backgroundThrottling`
disabled is now permanently `visible`.
This should also fix#6860 (but not for `webview`).
- Use `path` module from browser process in sandboxed renderer. This is required
because the return value of `path.join` is platform-specific, and this is an
assumtion of crash-reporter.js which is shared between sandboxed and
non-sandboxed renderers.
- Set `process.platform` and `process.execPath` in sandboxed renderer
environment. This is required to spawn the windows crash service from
sandboxed renderer.
- Use a single temporary directory for all crashReporter tests. This is required
to make tests more deterministic across platforms(since mac's crashpad doesn't
support changing the crash dump directory). Also make a few improvements/fixes
to the `uploadToServer` test.
