Added preliminary support for tile rasterization with Ganesh

cc/layers/picture_layer_impl.cc

Index: cc/layers/picture_layer_impl.cc
diff --git a/cc/layers/picture_layer_impl.cc b/cc/layers/picture_layer_impl.cc
index 39c0cb9e9d1dc01bd898583ec5b5de74078cfa67..1086d3f2dd1364e0bb9517eb13d816888c3e2e5d 100644
--- a/cc/layers/picture_layer_impl.cc
+++ b/cc/layers/picture_layer_impl.cc
@@ -468,6 +468,11 @@ scoped_refptr<Tile> PictureLayerImpl::CreateTile(PictureLayerTiling* tiling,
   if (!pile_->CanRaster(tiling->contents_scale(), content_rect))
     return scoped_refptr<Tile>();
 
+  // TODO(skaslev): Add a proper heuristic for hybrid (software or GPU)
+  // tile rasterization. Currently, when --enable-gpu-rasterization is
+  // set all tiles get GPU rasterized.
+  bool use_gpu_rasterizer =
+      layer_tree_impl()->settings().using_gpu_rasterization;
   return layer_tree_impl()->tile_manager()->CreateTile(
       pile_.get(),
       content_rect.size(),
@@ -476,7 +481,8 @@ scoped_refptr<Tile> PictureLayerImpl::CreateTile(PictureLayerTiling* tiling,
       tiling->contents_scale(),
       id(),
       layer_tree_impl()->source_frame_number(),
-      is_using_lcd_text_);
+      is_using_lcd_text_,
+      use_gpu_rasterizer);

[enne (OOO), 2013/11/27 23:33:26]

Thanks, I think this is much more in the direction I think we should go.

Based on https://code.google.com/p/skia/issues/detail?id=1849 I think we will
will probably want to go to a tri-state enum, but a simple boolean is fine for
now.

 }
 
 void PictureLayerImpl::UpdatePile(Tile* tile) {