Add a FOUC painting test.

Source/core/frame/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 90 matching lines @@
 #include "wtf/TemporaryChange.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
 // The maximum number of updateWidgets iterations that should be done before returning.
 static const unsigned maxUpdateWidgetsIterations = 2;
 static const double resourcePriorityUpdateDelayAfterScroll = 0.250;
 
+static bool s_initialTrackAllPaintInvalidations = false;
+
 FrameView::FrameView(LocalFrame* frame)
     : m_frame(frame)
     , m_displayMode(WebDisplayModeBrowser)
     , m_canHaveScrollbars(true)
     , m_slowRepaintObjectCount(0)
     , m_hasPendingLayout(false)
     , m_inSynchronousPostLayout(false)
     , m_postLayoutTasksTimer(this, &FrameView::postLayoutTimerFired)
     , m_updateWidgetsTimer(this, &FrameView::updateWidgetsTimerFired)
     , m_isTransparent(false)
@@ skipping 78 matching lines @@
     m_inPerformLayout = false;
     m_inSynchronousPostLayout = false;
     m_layoutCount = 0;
     m_nestedLayoutCount = 0;
     m_postLayoutTasksTimer.stop();
     m_updateWidgetsTimer.stop();
     m_firstLayout = true;
     m_safeToPropagateScrollToParent = true;
     m_lastViewportSize = IntSize();
     m_lastZoomFactor = 1.0f;
-    m_isTrackingPaintInvalidations = false;
+    m_isTrackingPaintInvalidations = s_initialTrackAllPaintInvalidations;
     m_trackedPaintInvalidationRects.clear();
     m_lastPaintTime = 0;
     m_isPainting = false;
     m_visuallyNonEmptyCharacterCount = 0;
     m_visuallyNonEmptyPixelCount = 0;
     m_isVisuallyNonEmpty = false;
     clearScrollAnchor();
     m_viewportConstrainedObjects.clear();
     m_layoutSubtreeRootList.clear();
 }
@@ skipping 1427 matching lines @@
     Page* page = frame().page();
     if (!page)
         return nullptr;
     return &page->chromeClient();
 }
 
 void FrameView::contentRectangleForPaintInvalidation(const IntRect& rectInContent)
 {
     ASSERT(!m_frame->ownerLayoutObject());
 
-    if (m_isTrackingPaintInvalidations) {
-        m_trackedPaintInvalidationRects.append(contentsToFrame(rectInContent));
-        // FIXME: http://crbug.com/368518. Eventually, invalidateContentRectangleForPaint
-        // is going away entirely once all layout tests are FCM. In the short
-        // term, no code should be tracking non-composited FrameView paint invalidations.
-        RELEASE_ASSERT_NOT_REACHED();
-    }
-
     IntRect paintRect = rectInContent;
     if (clipsPaintInvalidations())
         paintRect.intersect(visibleContentRect());
     if (paintRect.isEmpty())
         return;
 
     if (HostWindow* window = hostWindow())
         window->invalidateRect(contentsToRootFrame(paintRect));
 }
 
@@ skipping 1141 matching lines @@
         IntPoint point = parentView->convertToLayoutObject(*layoutObject, parentPoint);
         // Subtract borders and padding
         point.move(-layoutObject->borderLeft() - layoutObject->paddingLeft(),
             -layoutObject->borderTop() - layoutObject->paddingTop());
         return point;
     }
 
     return parentPoint;
 }
 
+void FrameView::setInitialTracksPaintInvalidationsForUnitTestsOnly(bool trackPaintInvalidations)
+{
+    s_initialTrackAllPaintInvalidations = trackPaintInvalidations;
+}
+
 void FrameView::setTracksPaintInvalidations(bool trackPaintInvalidations)
 {
     if (trackPaintInvalidations == m_isTrackingPaintInvalidations)
         return;
 
     for (Frame* frame = m_frame->tree().top(); frame; frame = frame->tree().traverseNext()) {
         if (!frame->isLocalFrame())
             continue;
         if (LayoutView* layoutView = toLocalFrame(frame)->contentLayoutObject())
             layoutView->compositor()->setTracksPaintInvalidations(trackPaintInvalidations);
@@ skipping 1135 matching lines @@
 
     if (!graphicsLayer)
         return;
 
     DeprecatedPaintLayer::mapRectToPaintInvalidationBacking(localFrame->contentLayoutObject(), paintInvalidationContainer, viewRect);
 
     graphicsLayerTimingRequests.add(graphicsLayer, Vector<std::pair<int64_t, WebRect>>()).storedValue->value.append(std::make_pair(m_frame->frameID(), enclosingIntRect(viewRect)));
 }
 
 } // namespace blink