Raster PictureLayerTiling with fractional translation

cc/tiles/tile.cc

Index: cc/tiles/tile.cc
diff --git a/cc/tiles/tile.cc b/cc/tiles/tile.cc
index b43383fd68bdb70d03ac717e0204c92e44f49974..4432d98c52d0e3cfc4d8628c37e704e792a099b6 100644
--- a/cc/tiles/tile.cc
+++ b/cc/tiles/tile.cc
@@ -26,7 +26,7 @@ Tile::Tile(TileManager* tile_manager,
       tiling_(info.tiling),
       content_rect_(info.content_rect),
       enclosing_layer_rect_(info.enclosing_layer_rect),
-      contents_scale_(info.contents_scale),
+      raster_transform_(info.raster_transform),
       layer_id_(layer_id),
       source_frame_number_(source_frame_number),
       flags_(flags),
@@ -49,7 +49,13 @@ Tile::~Tile() {
 void Tile::AsValueInto(base::trace_event::TracedValue* value) const {
   TracedValue::MakeDictIntoImplicitSnapshotWithCategory(
       TRACE_DISABLED_BY_DEFAULT("cc.debug"), value, "cc::Tile", this);
-  value->SetDouble("contents_scale", contents_scale());
+  value->SetDouble("contents_scale", contents_scale_key());
+
+  value->BeginArray("raster_transform");
+  value->AppendDouble(raster_transform_.scale());
+  value->AppendDouble(raster_transform_.translation().x());
+  value->AppendDouble(raster_transform_.translation().y());
+  value->EndArray();
 
   MathUtil::AddToTracedValue("content_rect", content_rect_, value);