Factor out didDraw / didDrawEntireCanvas calls in canvas drawing functions

[Cameron McCormack (:heycam)]

There are various canvas drawing functions in CanvasRenderingContext2DBase that end similarly:

```
    if (isEntireBackingStoreDirty())
        didDraw(std::nullopt);
    else if (repaintEntireCanvas)
        didDrawEntireCanvas();
    else
        didDraw(... some rect calculation ...);
```

We can factor out the commonality.

[Radar WebKit Bug Importer]

<rdar://problem/84834950>

[Cameron McCormack (:heycam)]

Created attachment 442904 [details]
Patch

[Antti Koivisto]

Comment on attachment 442904 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=442904&action=review

> Source/WebCore/html/canvas/CanvasRenderingContext2DBase.cpp:1065
> +        return path.fastBoundingRect();

I suppose this is the case where computing the rect is expensive? (thus the lambda)

[Cameron McCormack (:heycam)]

(In reply to Antti Koivisto from comment #3)
> > Source/WebCore/html/canvas/CanvasRenderingContext2DBase.cpp:1065
> > +        return path.fastBoundingRect();
> 
> I suppose this is the case where computing the rect is expensive? (thus the
> lambda)

I imagine so.  I didn't measure.  But I know Simon was careful previously not to compute it if not needed.

[EWS]

Tools/Scripts/svn-apply failed to apply attachment 442904 [details] to trunk.
Please resolve the conflicts and upload a new patch.

[Cameron McCormack (:heycam)]

Created attachment 443371 [details]
Patch for landing

[Cameron McCormack (:heycam)]

Created attachment 443374 [details]
Patch for landing

[EWS]

Committed r285334 (243897@main): <https://commits.webkit.org/243897@main>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 443374 [details].