Merge setVisibleRectTrajectoryVector and adjustVisibleRect to the more descriptive...

Merge setVisibleRectTrajectoryVector and adjustVisibleRect to the more descriptive coverWithTilesIfNeeded https://bugs.webkit.org/show_bug.cgi?id=79230

Reviewed by Simon Hausmann.

Source/WebCore:

Both setVisibleRectTrajectoryVector and the adjustVisibleRect are
used for initiating re-tiling, so make that more obvious and merge
the two.

* platform/graphics/TiledBackingStore.cpp:
(WebCore::TiledBackingStore::coverWithTilesIfNeeded):
* platform/graphics/TiledBackingStore.h:
(TiledBackingStore):

Source/WebKit/qt:

* Api/qgraphicswebview.cpp:
(QGraphicsWebView::paint):

    Use coverWithTilesIfNeeded().

Source/WebKit2:

Replace use by coverWithTilesIfNeeded().

* WebProcess/WebCoreSupport/WebGraphicsLayer.cpp:
(WebCore::WebGraphicsLayer::setVisibleContentRectTrajectoryVector):
(WebCore::WebGraphicsLayer::adjustVisibleRect):
(WebCore::WebGraphicsLayer::computeTransformedVisibleRect):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@108491 268f45cc-cd09-0410-ab3c-d52691b4dbfc