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fix: disable background throttling also in the viz::DisplayScheduler (#38924)

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* fix: disable background throttling also in the `viz::DisplayScheduler`

`viz::DisplayScheduler` is responsible for drawing and swapping frames
in the `DisplayScheduler::DrawAndSwap` which is called from the
`DisplayScheduler::AttemptDrawAndSwap` if the `DisplayScheduler::ShouldDraw`
returns true. `ShouldDraw` depends on the `DisplayScheduler` visibility
and when it is not visible then it returns false.

In order to keep producing frames, disabling `backgroundThrottling`
should also prevent changing `DisplayScheduler` visibility to false.

`DisplayScheduler` lives in the `ui::Compositor` where every
`electron::NativewWindow` has its own `Compositor`. `electron::NativewWindow`
may be host of the multiple `electron::api::WebContents` instances which may
have different `WebPreferences` settings. Therefore if at least one
of the `WebContents` requires disabling throttling then all other `WebContents`
using the same window will have it disabled in the `ui::Compositor`.

BREAKING CHANGE:
`backgroundThrottling` set to false will disable frames throttling
in the `BrowserWindow` for all `WebContents` displayed by it.

Close: [#31016](https://github.com/electron/electron/issues/31016)

* fixup! fix: disable background throttling also in the `viz::DisplayScheduler`

* fixup! fix: disable background throttling also in the `viz::DisplayScheduler`

* fixup! fix: disable background throttling also in the `viz::DisplayScheduler`

---------

Co-authored-by: John Kleinschmidt <jkleinsc@electronjs.org>
This commit is contained in:
michal-pichlinski-openfin 2023-09-26 22:00:46 +02:00 • committed by GitHub
parent fa215f1009
commit 2190793fe6
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10 changed files with 176 additions and 3 deletions
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6
shell/browser/api/electron_api_web_contents.h
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@ -36,6 +36,7 @@
#include "printing/buildflags/buildflags.h"
#include "shell/browser/api/frame_subscriber.h"
#include "shell/browser/api/save_page_handler.h"
#include "shell/browser/background_throttling_source.h"
#include "shell/browser/event_emitter_mixin.h"
#include "shell/browser/extended_web_contents_observer.h"
#include "shell/browser/ui/inspectable_web_contents.h"
@ -107,7 +108,8 @@ class WebContents : public ExclusiveAccessContext,
public content::WebContentsDelegate,
public content::RenderWidgetHost::InputEventObserver,
public InspectableWebContentsDelegate,
public InspectableWebContentsViewDelegate {
public InspectableWebContentsViewDelegate,
public BackgroundThrottlingSource {
public:
enum class Type {
kBackgroundPage, // An extension background page.
@ -160,7 +162,7 @@ class WebContents : public ExclusiveAccessContext,
void Close(absl::optional<gin_helper::Dictionary> options);
base::WeakPtr<WebContents> GetWeakPtr() { return weak_factory_.GetWeakPtr(); }
bool GetBackgroundThrottling() const;
bool GetBackgroundThrottling() const override;
void SetBackgroundThrottling(bool allowed);
int GetProcessID() const;
base::ProcessId GetOSProcessID() const;