Clip nodes to the visible rect.

Do not build scrollable layers if the layer does not draw. No need to ask for a
sync since the rebuild happens during a sync.

Bug: 3429982
Change-Id: I7740cd4de4e1658e760da7391de708cbdf05cd44

1 files changed, 1 insertions, 3 deletions

diff --git a/WebCore/platform/graphics/android/GraphicsLayerAndroid.cpp b/WebCore/platform/graphics/android/GraphicsLayerAndroid.cpp
index 49f20ab..ccc872a 100644
--- a/WebCore/platform/graphics/android/GraphicsLayerAndroid.cpp
+++ b/WebCore/platform/graphics/android/GraphicsLayerAndroid.cpp
@@ -467,7 +467,7 @@ void GraphicsLayerAndroid::updateScrollingLayers()
 {
 #if ENABLE(ANDROID_OVERFLOW_SCROLL)
     RenderLayer* layer = renderLayerFromClient(m_client);
-    if (!layer)
+    if (!layer || !m_haveContents)
         return;
     bool hasOverflowScroll = m_foregroundLayer || m_contentLayer->contentIsScrollable();
     bool layerNeedsOverflow = layer->hasOverflowScroll();
@@ -508,7 +508,6 @@ void GraphicsLayerAndroid::updateScrollingLayers()
         }
         // Need to rebuild our children based on the new structure.
         m_needsSyncChildren = true;
-        askForSync();
     } else {
         ASSERT(hasOverflowScroll && !layerNeedsOverflow && !iframeNeedsOverflow);
         ASSERT(m_contentLayer);
@@ -531,7 +530,6 @@ void GraphicsLayerAndroid::updateScrollingLayers()
         }
         // Children are all re-parented.
         m_needsSyncChildren = true;
-        askForSync();
     }
 #endif
 }