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 e45128bc646f0ab46bed0802f2b6d7b5ceeaf41a..3f9387988985ace0da00a4c54359ea1046c286f6 100644
--- a/cc/layers/delegated_renderer_layer_impl_unittest.cc
+++ b/cc/layers/delegated_renderer_layer_impl_unittest.cc
@@ -602,6 +602,7 @@ 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.MaybeAppend(render_pass_quad.PassAs<DrawQuad>());
 
@@ -1031,6 +1032,7 @@ 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.MaybeAppend(render_pass_quad.PassAs<DrawQuad>());