Added some mixins for components

PiperOrigin-RevId: 175895085

Author: Googler

lib/material_button/_mixins.scss

@@ -257,6 +257,12 @@ $button-disabled-background-dark: rgba(255, 255, 255, $mat-divider-opacity);
   }
 }
 
+@mixin icon-button-padding($selector, $padding) {
+  #{$selector}[icon] ::ng-deep .content {
+    padding: $padding;
+  }
+}
+
 /// Mixin to create a raised button taking an optional color of the button.
 ///
 /// Should be scopped to the specific button needed to make raised.

lib/material_dialog/_mixins.scss

@@ -82,3 +82,9 @@
     @include flex-flow($flow);
   }
 }
+
+@mixin simple-dialog-min-width($min-width) {
+  ::ng-deep .modal material-dialog.simple-dialog {
+    min-width: $min-width;
+  }
+}