[Webkit-unassigned] [Bug 88225] New: Web Inspector: platform support for timeline frame instrumentation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=88225

           Summary: Web Inspector: platform support for timeline frame
                    instrumentation
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: caseq at chromium.org
                CC: timothy at apple.com, rik at webkit.org, keishi at webkit.org,
                    pmuellr at yahoo.com, joepeck at webkit.org,
                    pfeldman at chromium.org, yurys at chromium.org,
                    bweinstein at apple.com


This is an umbrella issue for timeline frame instrumentation support by various platforms. At the moment, frame instrumentation is only supported by chromium.

The following needs to be done to enable frame instrumentation:
- embedder must invoke InspectorInstrumentation::didBeginFrame() when it starts rendering a new frame
- embedder may invoke InspectorInstrumentation::didCancelFrame() if it decides to cancel frame rendering early but after a call to didBeginFrame() (e.g. no layout updates etc);
- embedder must override InspectorClient::supportsFrameInstrumentation() so that it returns true iff embedder will call InspectorInstrumentation::didBeginFrame()

The above will enable "Frame" overview mode in the Timeline panel that aggregates events by frame and exposes frame marks on the lower pane.

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