Repaint tests don't work in WebKit2

Repaint tests don't work in WebKit2
https://bugs.webkit.org/show_bug.cgi?id=68453

Tools:

Reviewed by Sam Weinig.

Convert DumpRenderTree to use use the repaint rects
exposed via WebKit API when generating the repaint test
overlay.

Fix WebKitTestRunner to work with repaint tests, again
using the repaint rects exposed from WK2.

In both cases, layoutTestController.display() now just
forces a display of the web view, and turns on repaint
rect tracking on the main FrameView.

Later, when pixel results are requested, the alpha overlay
that shows the repaint rects is generated using the list
of rects supplied by WebCore.

* DumpRenderTree/mac/DumpRenderTree.mm:
(resetDefaultsToConsistentValues):
(resetWebViewToConsistentStateBeforeTesting):
(displayWebView):
* DumpRenderTree/mac/PixelDumpSupportMac.mm:
(paintRepaintRectOverlay):
(createBitmapContextFromWebView):
* WebKitTestRunner/InjectedBundle/InjectedBundle.cpp:
(WTR::InjectedBundle::beginTesting):
(WTR::InjectedBundle::done):
* WebKitTestRunner/InjectedBundle/InjectedBundle.h:
(WTR::InjectedBundle::setRepaintRects):
* WebKitTestRunner/InjectedBundle/InjectedBundlePage.cpp:
(WTR::InjectedBundlePage::reset):
(WTR::InjectedBundlePage::dump):
* WebKitTestRunner/InjectedBundle/LayoutTestController.cpp:
(WTR::LayoutTestController::display):
* WebKitTestRunner/TestInvocation.cpp:
(WTR::TestInvocation::didReceiveMessageFromInjectedBundle):
* WebKitTestRunner/TestInvocation.h:
* WebKitTestRunner/cg/TestInvocationCG.cpp:
(WTR::paintRepaintRectOverlay):
(WTR::TestInvocation::dumpPixelsAndCompareWithExpected):

LayoutTests:

Reviewed by Sam Weinig.

Update Mac results to use the new repaint rects. Differences from old results:
	        * There are no longer invalidates from scrolling.
	        * We no longer see the effects of AppKit rect coalescing.
	        * Composting tests show the overlay now, but repaints in compositing layers do not show.

	    Bad results in a couple of tests are covered by bugs 68830 and 68829.

* platform/mac/fast/repaint/4774354-expected.png:
* platform/mac/fast/repaint/block-layout-inline-children-float-positioned-expected.png:
* platform/mac/fast/repaint/block-selection-gap-in-composited-layer-expected.png:
* platform/mac/fast/repaint/border-radius-repaint-expected.png:
* platform/mac/fast/repaint/clipped-relative-expected.png:
* platform/mac/fast/repaint/containing-block-position-change-expected.png:
* platform/mac/fast/repaint/control-clip-expected.png:
* platform/mac/fast/repaint/delete-into-nested-block-expected.png:
* platform/mac/fast/repaint/fixed-and-absolute-position-scrolled-expected.png:
* platform/mac/fast/repaint/fixed-scroll-simple-expected.png:
* platform/mac/fast/repaint/flexible-box-overflow-expected.png:
* platform/mac/fast/repaint/flexible-box-overflow-horizontal-expected.png:
* platform/mac/fast/repaint/float-move-during-layout-expected.png:
* platform/mac/fast/repaint/float-overflow-expected.png:
* platform/mac/fast/repaint/float-overflow-right-expected.png:
* platform/mac/fast/repaint/iframe-scroll-repaint-expected.png:
* platform/mac/fast/repaint/inline-block-overflow-expected.png:
* platform/mac/fast/repaint/japanese-rl-selection-repaint-expected.png:
* platform/mac/fast/repaint/japanese-rl-selection-repaint-in-regions-expected.png:
* platform/mac/fast/repaint/layer-child-outline-expected.png:
* platform/mac/fast/repaint/layer-outline-expected.png:
* platform/mac/fast/repaint/layer-outline-horizontal-expected.png:
* platform/mac/fast/repaint/line-flow-with-floats-in-regions-expected.png:
* platform/mac/fast/repaint/line-overflow-expected.png:
* platform/mac/fast/repaint/nested-iframe-scroll-inner-expected.png:
* platform/mac/fast/repaint/nested-iframe-scroll-outer-expected.png:
* platform/mac/fast/repaint/outline-child-repaint-expected.png:
* platform/mac/fast/repaint/outline-shrinking-expected.png:
* platform/mac/fast/repaint/overflow-delete-line-expected.png:
* platform/mac/fast/repaint/overflow-flipped-writing-mode-block-in-regions-expected.png:
* platform/mac/fast/repaint/repaint-during-scroll-expected.png:
* platform/mac/fast/repaint/scale-page-shrink-expected.png:
* platform/mac/fast/repaint/search-field-cancel-expected.png:
* platform/mac/fast/repaint/selection-after-remove-expected.png:
* platform/mac/fast/repaint/shadow-multiple-horizontal-expected.png:
* platform/mac/fast/repaint/shadow-multiple-strict-horizontal-expected.png:
* platform/mac/fast/repaint/shadow-multiple-strict-vertical-expected.png:
* platform/mac/fast/repaint/shadow-multiple-vertical-expected.png:
* platform/mac/fast/repaint/static-to-positioned-expected.png:
* platform/mac/fast/repaint/table-cell-move-expected.png:
* platform/mac/fast/repaint/text-selection-rect-in-overflow-2-expected.png:
* platform/mac/fast/repaint/text-shadow-expected.png:
* platform/mac/fast/repaint/text-shadow-horizontal-expected.png:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@96005 268f45cc-cd09-0410-ab3c-d52691b4dbfc