cc: Add mask target size to the effect tree

cc/layers/render_surface_impl.cc

Index: cc/layers/render_surface_impl.cc
diff --git a/cc/layers/render_surface_impl.cc b/cc/layers/render_surface_impl.cc
index 10f39b0e52a82f8b70441285baa1fe8bc1e3c304..264a6de45abdbbfc2c055ee71dcc28d9c93e446d 100644
--- a/cc/layers/render_surface_impl.cc
+++ b/cc/layers/render_surface_impl.cc
@@ -396,8 +396,8 @@ void RenderSurfaceImpl::AppendQuads(RenderPass* render_pass,
         MathUtil::ComputeTransform2dScaleComponents(owning_layer_draw_transform,
                                                     1.f);
     gfx::SizeF unclipped_mask_target_size = gfx::ScaleSize(
-        gfx::SizeF(owning_layer_->bounds()), owning_layer_draw_scale.x(),
-        owning_layer_draw_scale.y());
+        gfx::SizeF(OwningEffectNode()->unscaled_mask_target_size),
+        owning_layer_draw_scale.x(), owning_layer_draw_scale.y());
     mask_uv_scale = gfx::Vector2dF(1.0f / unclipped_mask_target_size.width(),
                                    1.0f / unclipped_mask_target_size.height());
   }