fix(card): Use on-surface color for action icons (#4519)

Author: kfranqueiro

packages/mdc-card/_mixins.scss

@@ -174,7 +174,7 @@
 
   .mdc-card__action-icons {
     @include mdc-feature-targets($feat-color) {
-      @include mdc-theme-prop(color, text-icon-on-background);
+      @include mdc-theme-prop(color, $mdc-card-action-icon-color);
     }
 
     @include mdc-feature-targets($feat-structure) {
@@ -264,7 +264,7 @@
 
   .mdc-card__action--icon:not(:disabled) {
     @include mdc-feature-targets($feat-color) {
-      @include mdc-theme-prop(color, text-icon-on-background);
+      @include mdc-theme-prop(color, $mdc-card-action-icon-color);
     }
   }
 

packages/mdc-card/_variables.scss

@@ -21,6 +21,8 @@
 //
 
 @import "@material/theme/mixins";
+@import "@material/theme/variables";
 
+$mdc-card-action-icon-color: rgba(mdc-theme-prop-value(on-surface), mdc-theme-text-emphasis(medium)) !default;
 $mdc-card-outline-color: mix(mdc-theme-prop-value(on-surface), mdc-theme-prop-value(surface), 12%) !default;
 $mdc-card-outline-width: 1px !default;

test/screenshot/golden.json

@@ -160,11 +160,11 @@
     }
   },
   "spec/mdc-card/classes/media.html": {
-    "public_url": "https://storage.googleapis.com/mdc-web-screenshot-tests/travis/2018/11/02/14_50_15_747/spec/mdc-card/classes/media.html?utm_source=golden_json",
+    "public_url": "https://storage.googleapis.com/mdc-web-screenshot-tests/kfranqueiro/2019/03/25/21_32_26_116/spec/mdc-card/classes/media.html?utm_source=golden_json",
     "screenshots": {
-      "desktop_windows_chrome@latest": "https://storage.googleapis.com/mdc-web-screenshot-tests/travis/2018/11/02/14_50_15_747/spec/mdc-card/classes/media.html.windows_chrome_69.png",
-      "desktop_windows_firefox@latest": "https://storage.googleapis.com/mdc-web-screenshot-tests/travis/2018/11/02/14_50_15_747/spec/mdc-card/classes/media.html.windows_firefox_62.png",
-      "desktop_windows_ie@11": "https://storage.googleapis.com/mdc-web-screenshot-tests/travis/2018/11/02/14_50_15_747/spec/mdc-card/classes/media.html.windows_ie_11.png"
+      "desktop_windows_chrome@latest": "https://storage.googleapis.com/mdc-web-screenshot-tests/kfranqueiro/2019/03/25/21_32_26_116/spec/mdc-card/classes/media.html.windows_chrome_72.png",
+      "desktop_windows_firefox@latest": "https://storage.googleapis.com/mdc-web-screenshot-tests/kfranqueiro/2019/03/25/21_32_26_116/spec/mdc-card/classes/media.html.windows_firefox_65.png",
+      "desktop_windows_ie@11": "https://storage.googleapis.com/mdc-web-screenshot-tests/kfranqueiro/2019/03/25/21_32_26_116/spec/mdc-card/classes/media.html.windows_ie_11.png"
     }
   },
   "spec/mdc-card/mixins/color-and-shape.html": {