[webkit-reviews] review requested: [Bug 73235] [Chromium] Support adding/removing page overlay to WebView : [Attachment 117264] Use getDirtyRect to avoid unnecessary paint and fixed a webview resize issue

[bugzilla-daemon at webkit.org]

xiyuan <xiyuan at chromium.org> has asked	for review:
Bug 73235: [Chromium] Support adding/removing page overlay to WebView
https://bugs.webkit.org/show_bug.cgi?id=73235

Attachment 117264: Use getDirtyRect to avoid unnecessary paint and fixed a
webview resize issue
https://bugs.webkit.org/attachment.cgi?id=117264&action=review

------- Additional Comments from xiyuan <xiyuan at chromium.org>
Change updated:
- Added a getDirtyRect to overlay client in order to avoid unnecessary painting
during compositing;
- Handle webview resize in PageOverlay::update to ensure overlay layer is big
enough and on top of scrollbars;

Please take another look. Thanks.