add codeowner, theme dep

Author: annieyw

.github/CODEOWNERS

@@ -177,6 +177,7 @@
 /src/dev-app/mdc-list/**                           @mmalerba
 /src/dev-app/mdc-menu/**                           @crisbeto
 /src/dev-app/mdc-progress-bar/**                   @crisbeto
+/src/dev-app/mdc-progress-spinner/**               @annieyw @mmalerba
 /src/dev-app/mdc-radio/**                          @mmalerba
 /src/dev-app/mdc-snack-bar/**                      @andrewseguin
 /src/dev-app/mdc-sidenav/**                        @crisbeto
@@ -236,6 +237,7 @@
 /src/e2e-app/mdc-input/**                          @devversion
 /src/e2e-app/mdc-menu/**                           @crisbeto
 /src/e2e-app/mdc-progress-bar/**                   @crisbeto
+/src/e2e-app/mdc-progress-spinner/**               @annieyw @mmalerba
 /src/e2e-app/mdc-radio/**                          @mmalerba
 /src/e2e-app/mdc-slider/**                         @andrewseguin
 /src/e2e-app/mdc-slide-toggle/**                   @crisbeto

src/material-experimental/mdc-theming/BUILD.bazel

@@ -25,6 +25,7 @@ sass_library(
         "//src/material-experimental/mdc-list:mdc_list_scss_lib",
         "//src/material-experimental/mdc-menu:mdc_menu_scss_lib",
         "//src/material-experimental/mdc-progress-bar:mdc_progress_bar_scss_lib",
+        "//src/material-experimental/mdc-progress-spinner:mdc_progress_spinner_scss_lib",
         "//src/material-experimental/mdc-radio:mdc_radio_scss_lib",
         "//src/material-experimental/mdc-slide-toggle:mdc_slide_toggle_scss_lib",
         "//src/material-experimental/mdc-slider:mdc_slider_scss_lib",