Implement hidpi and pinch-zoom scaling of filter params in cc.

cc/layers/delegated_renderer_layer_impl_unittest.cc

Index: cc/layers/delegated_renderer_layer_impl_unittest.cc
diff --git a/cc/layers/delegated_renderer_layer_impl_unittest.cc b/cc/layers/delegated_renderer_layer_impl_unittest.cc
index f398894165e23cdfcd45c93cb11a0c7d524450a7..c324fac14f52935d7a7fe971b0003c2c2662084f 100644
--- a/cc/layers/delegated_renderer_layer_impl_unittest.cc
+++ b/cc/layers/delegated_renderer_layer_impl_unittest.cc
@@ -605,6 +605,7 @@ class DelegatedRendererLayerImplTestTransform
         child_pass_rect,        // contents_changed_since_last_frame
         gfx::RectF(),           // mask_uv_rect
         FilterOperations(),     // filters
+        gfx::Vector2dF(),       // filters_scale
         FilterOperations());    // background_filters
     quad_sink.Append(render_pass_quad.PassAs<DrawQuad>(), &data);
 
@@ -1036,6 +1037,7 @@ class DelegatedRendererLayerImplTestClip
         child_pass_rect,        // contents_changed_since_last_frame
         gfx::RectF(),           // mask_uv_rect
         FilterOperations(),     // filters
+        gfx::Vector2dF(),       // filters_scale
         FilterOperations());    // background_filters
     quad_sink.Append(render_pass_quad.PassAs<DrawQuad>(), &data);