Reland "Raster display item lists via a visual rect RTree."

cc/layers/picture_layer_impl_unittest.cc

Index: cc/layers/picture_layer_impl_unittest.cc
diff --git a/cc/layers/picture_layer_impl_unittest.cc b/cc/layers/picture_layer_impl_unittest.cc
index a35faf5db6a7640f27585ddf1d51998db91e3792..3e0d73492cce2d446122f55832524d463f0800e7 100644
--- a/cc/layers/picture_layer_impl_unittest.cc
+++ b/cc/layers/picture_layer_impl_unittest.cc
@@ -270,7 +270,7 @@ class PictureLayerImplTest : public TestLayerTreeHostBase {
   void SetInitialDeviceScaleFactor(float device_scale_factor) {
     // Device scale factor is a per-tree property. However, tests can't directly
     // set the pending tree's device scale factor before the pending tree is
-    // created, and setting it after SetupPendingTreeis too late, since
+    // created, and setting it after SetupPendingTree is too late, since
     // draw properties will already have been updated on the tree. To handle
     // this, we initially set only the active tree's device scale factor, and we
     // copy this over to the pending tree inside SetupPendingTree.