In order to track the rate at which the WebView is drawing to the screen, we need a 'didDraw' callback.
Created attachment 70562 [details]
http://trac.webkit.org/changeset/69600 for Mac.
Keeping open for Windows and WebKit2.
Comment on attachment 70562 [details]
Cleared Sam Weinig's review+ from obsolete attachment 70562 [details] so that this bug does not appear in http://webkit.org/pending-commit.
Created attachment 70903 [details]
Attachment 70903 [details] did not pass style-queue:
Failed to run "['WebKitTools/Scripts/check-webkit-style']" exit_code: 1
WebKit2/UIProcess/API/C/WKPage.h:163: Extra space between WKPageDidDraw and didDraw [whitespace/declaration] 
Total errors found: 1 in 7 files
If any of these errors are false positives, please file a bug against check-webkit-style.
Attachment 70903 [details] did not build on qt:
Build output: http://queues.webkit.org/results/4456051
Created attachment 70905 [details]
Comment on attachment 70905 [details]
Keep open for Windows.
Is this still needed?