Rename Document::ownerElement to localOwner and fix main frame checks.

third_party/WebKit/Source/core/layout/compositing/CompositingReasonFinder.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/layout/compositing/CompositingReasonFinder.h"
 
 #include "core/CSSPropertyNames.h"
 #include "core/dom/Document.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/Settings.h"
@@ skipping 22 matching lines @@
     }
 }
 
 bool CompositingReasonFinder::hasOverflowScrollTrigger() const
 {
     return m_compositingTriggers & OverflowScrollTrigger;
 }
 
 bool CompositingReasonFinder::isMainFrame() const
 {
-    // FIXME: LocalFrame::isMainFrame() is probably better.
-    return !m_layoutView.document().ownerElement();
+    return m_layoutView.document().isInMainFrame();
 }
 
 CompositingReasons CompositingReasonFinder::directReasons(const PaintLayer* layer) const
 {
     if (RuntimeEnabledFeatures::slimmingPaintV2Enabled())
         return CompositingReasonNone;
 
     ASSERT(potentialCompositingReasonsFromStyle(layer->layoutObject()) == layer->potentialCompositingReasonsFromStyle());
     CompositingReasons styleDeterminedDirectCompositingReasons = layer->potentialCompositingReasonsFromStyle() & CompositingReasonComboAllDirectStyleDeterminedReasons;
 
@@ skipping 124 matching lines @@
 bool CompositingReasonFinder::requiresCompositingForPositionFixed(const PaintLayer* layer) const
 {
     if (!(m_compositingTriggers & ViewportConstrainedPositionedTrigger))
         return false;
     // Don't promote fixed position elements that are descendants of a non-view container, e.g. transformed elements.
     // They will stay fixed wrt the container rather than the enclosing frame.
     return layer->scrollsWithViewport() && m_layoutView.frameView()->isScrollable();
 }
 
 } // namespace blink