https://bugs.webkit.org/show_bug.cgi?id=126531
<rdar://problem/15745862>

Reviewed by Anders Carlsson.

Source/WebCore:

* platform/graphics/ca/mac/TileController.h:
* platform/graphics/ca/mac/TileController.mm:
(WebCore::TileController::tilesWouldChangeForVisibleRect):
(WebCore::TileController::scaledExposedRect):
(WebCore::TileController::computeTileCoverageRect):
(WebCore::TileController::revalidateTiles):
(WebCore::TileController::updateTileCoverageMap):
Scale the FrameView-space exposedRect into document space, to match the visibleRect.

Flipping on WKView's clipsToExposedRect now works correctly even in Safari
or MiniBrowser with zooming.

Source/WebKit2:

* UIProcess/API/ios/WKContentView.mm:
(-[WKContentView _updateViewExposedRect]):
(-[WKContentView setViewportSize:]):
(-[WKContentView didFinishScrollTo:]):
(-[WKContentView didScrollTo:]):
(-[WKContentView didZoomToScale:]):
Because zooming is performed by the UIScrollView, we need to transform
the exposedRect's offset in order to get it in FrameView-relative coordinates.

* UIProcess/ios/WebPageProxyIOS.mm:
(WebKit::WebPageProxy::didFinishZooming):
Save the pageScaleFactor when it changes.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@162189 268f45cc-cd09-0410-ab3c-d52691b4dbfc