[Webkit-unassigned] [Bug 126261] New: [WK2][CoordinatedGraphics] Adding callback to let WebView know that WebPageProxy has changed its pageScaleFactor

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=126261

           Summary: [WK2][CoordinatedGraphics] Adding callback to let
                    WebView know that WebPageProxy has changed its
                    pageScaleFactor
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit2
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: thiago.lacerda at openbossa.org


After r161087, the scale factor is being set directly in WebPageProxy, avoiding information duplication of the scale factor.
However, it takes a while to the scale factor gets applied in WebProcess and get back to UIProcess (WebPageProxy) due do IPC.
So, during this interval, if the user queries the contentScaleFactor to the WebView he will get the old scale factor.
This callback is useful to let the user know when it can rely on the contentScaleFactor. It is also important for API tests that might use contentScaleFactor

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