Raster PictureLayerTiling with fractional translation

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

Index: third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp
diff --git a/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp b/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp
index a7fed4bbf4e357459361c4d6df8360732c1993b5..80b3d32b2eae3aa8e18f594a711bc1aafb68ed7c 100644
--- a/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp
+++ b/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp
@@ -505,6 +505,16 @@ void CompositedLayerMapping::updateContentsOpaque() {
   }
 }
 
+void CompositedLayerMapping::updateRasterizationPolicy() {
+  bool allowTransformedRasterization =
+      !requiresCompositing(m_owningLayer.getCompositingReasons() &
+                           ~CompositingReasonSquashingDisallowed);
+  m_graphicsLayer->contentLayer()->setAllowTransformedRasterization(
+      allowTransformedRasterization);
+  if (m_squashingLayer)
+    m_squashingLayer->contentLayer()->setAllowTransformedRasterization(true);
+}
+
 void CompositedLayerMapping::updateCompositedBounds() {
   DCHECK_EQ(m_owningLayer.compositor()->lifecycle().state(),
             DocumentLifecycle::InCompositingUpdate);
@@ -1119,6 +1129,7 @@ void CompositedLayerMapping::updateGraphicsLayerGeometry(
   updateElementIdAndCompositorMutableProperties();
   updateBackgroundPaintsOntoScrollingContentsLayer();
   updateContentsOpaque();
+  updateRasterizationPolicy();
   updateAfterPartResize();
   updateRenderingContext();
   updateShouldFlattenTransform();