Don't composite layers with an invisible frameview.

third_party/WebKit/Source/core/frame/FrameView.cpp

Index: third_party/WebKit/Source/core/frame/FrameView.cpp
diff --git a/third_party/WebKit/Source/core/frame/FrameView.cpp b/third_party/WebKit/Source/core/frame/FrameView.cpp
index a6304a708559976dd77b0674c4d684c51db6b62f..a3f45decc8ba109fd3b56ebe5b69b47aec2cba06 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.cpp
+++ b/third_party/WebKit/Source/core/frame/FrameView.cpp
@@ -3801,6 +3801,10 @@ void FrameView::setParentVisible(bool visible)
     if (isParentVisible() == visible)
         return;
 
+    // As parent visibility changes, we may need to recomposite this frame view and potentially child frame views.
+    if (PaintLayerCompositor* compositor = layoutView() ? layoutView()->compositor() : nullptr)
+        compositor->setNeedsCompositingUpdate(CompositingUpdateRebuildTree);
+
     Widget::setParentVisible(visible);
 
     if (!isSelfVisible())
@@ -3816,8 +3820,9 @@ void FrameView::show()
         setSelfVisible(true);
         updateScrollableAreaSet();
         if (isParentVisible()) {
-            for (const auto& child : m_children)
+            for (const auto& child : m_children) {

[chrishtr, 2016/01/28 00:32:31]

Remove curlies.

[wkorman, 2016/01/28 00:55:21]

Done.

                 child->setParentVisible(true);
+            }
         }
     }