Mark positioned elements as needing a relayout when checking for hit test.

This is necessary when using composited fixed layers, as the layers position
may have moved UI-side, while the webkit's related position of those layers
may not have been updated yet.

Fix Bug:2457215

Change-Id: If4f0e9c3d1a4786b29dcc7c2dc3510ba090b6a36

2 files changed, 13 insertions, 0 deletions

diff --git a/WebCore/platform/graphics/android/GraphicsLayerAndroid.cpp b/WebCore/platform/graphics/android/GraphicsLayerAndroid.cpp
index fa4a180..3571a49 100644
--- a/WebCore/platform/graphics/android/GraphicsLayerAndroid.cpp
+++ b/WebCore/platform/graphics/android/GraphicsLayerAndroid.cpp
@@ -115,6 +115,7 @@ GraphicsLayerAndroid::GraphicsLayerAndroid(GraphicsLayerClient* client) :
     m_needsNotifyClient(false),
     m_haveContents(false),
     m_haveImage(false),
+    m_hasFixedLayers(false),
     m_translateX(0),
     m_translateY(0),
     m_currentTranslateX(0),
@@ -253,6 +254,13 @@ void GraphicsLayerAndroid::updateFixedPosition()
                                          offsetFromRenderer().width(),
                                          offsetFromRenderer().height(),
                                          w, h);
+
+        GraphicsLayerAndroid* rootGraphicsLayer = this;
+
+        while (rootGraphicsLayer->parent())
+            rootGraphicsLayer = static_cast<GraphicsLayerAndroid*>(rootGraphicsLayer->parent());
+
+        rootGraphicsLayer->setHasFixedLayers(true);
     }
 }
 
diff --git a/WebCore/platform/graphics/android/GraphicsLayerAndroid.h b/WebCore/platform/graphics/android/GraphicsLayerAndroid.h
index 25f70b4..d0347a7 100644
--- a/WebCore/platform/graphics/android/GraphicsLayerAndroid.h
+++ b/WebCore/platform/graphics/android/GraphicsLayerAndroid.h
@@ -121,6 +121,9 @@ public:
     void sendImmediateRepaint();
     LayerAndroid* contentLayer() { return m_contentLayer; }
 
+    bool hasFixedLayers() const { return m_hasFixedLayers; }
+    void setHasFixedLayers(bool val) { m_hasFixedLayers = val; }
+
     static int instancesCount();
 
 private:
@@ -139,6 +142,8 @@ private:
     bool m_haveContents;
     bool m_haveImage;
 
+    bool m_hasFixedLayers;
+
     float m_translateX;
     float m_translateY;
     float m_currentTranslateX;