Handle ui::Layer's visibility using cc::Layer's m_isDrawable flag

cc/layer.cc

Index: cc/layer.cc
diff --git a/cc/layer.cc b/cc/layer.cc
index 7b701554ce9d97f0c95366109d4c406916d87363..c23cbd033d4f0b5617fd83181cb094f89d3425a6 100644
--- a/cc/layer.cc
+++ b/cc/layer.cc
@@ -42,6 +42,7 @@ Layer::Layer()
     , m_isContainerForFixedPositionLayers(false)
     , m_fixedToContainerLayer(false)
     , m_isDrawable(false)
+    , m_visible(true)
     , m_masksToBounds(false)
     , m_contentsOpaque(false)
     , m_doubleSided(true)
@@ -547,6 +548,15 @@ void Layer::setIsDrawable(bool isDrawable)
     setNeedsCommit();
 }
 
+void Layer::setVisible(bool visible)
+{
+    if (m_visible == visible)
+        return;
+
+    m_visible = visible;
+    setNeedsCommit();
+}
+
 void Layer::setNeedsDisplayRect(const gfx::RectF& dirtyRect)
 {
     m_updateRect.Union(dirtyRect);
@@ -603,6 +613,7 @@ void Layer::pushPropertiesTo(LayerImpl* layer)
     layer->setDrawCheckerboardForMissingTiles(m_drawCheckerboardForMissingTiles);
     layer->setForceRenderSurface(m_forceRenderSurface);
     layer->setDrawsContent(drawsContent());
+    layer->setVisible(visible());
     layer->setFilters(filters());
     layer->setFilter(filter());
     layer->setBackgroundFilters(backgroundFilters());