extract remaining settings and functions to css/_core.scss

Move:
*   mat-grid
*   mat-icon-images

Move to client (only one client):
*   almost-{zero,one}

Remove (unused):
*   export-once
*   mat-option-export-*

Part of a sequence of CLs refactoring css/material into separate, smaller libraries

PiperOrigin-RevId: 225357983

Author: har79

angular_components/lib/css/_core.scss

@@ -0,0 +1,20 @@
+// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// Grid
+$mat-grid: 8px;
+$mat-grid-type: 4px;
+
+// Option that can be set before importing
+$mat-option-inline-icons: false !default;
+
+// Creates a reference for the given file in either data or package url format,
+// depending on the value of the global variable $mat-option-inline-icons.
+@function mat-icon-image($file) {
+  @if $mat-option-inline-icons {
+    @return inline-image($file)
+  } @else {
+    @return url("package:#{$file}")
+  }
+}

angular_components/lib/css/material/const/_functions.scss

@@ -2,42 +2,4 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// #############################################################################
-//
-// WARNING: DO NOT IMPORT DIRECTLY OUTSIDE OF
-// THIRD_PARTY/DART_SRC/ACX/CSS/MATERIAL
-//
-// #############################################################################
-
-
-// It is not possible to place @imports within control statements. So we control
-// what css classes and extendable classes are visible through this directive
-// and a list.
-//
-// Usage for acx-example.scss:
-//
-//     $variable: "Does not have to be within export-once";
-//     @mixin also-can-be-outside() { }
-//
-//     @include export-once('acx-unique-string-name') {
-//       .class-you-only-want-imported-once { }
-//       %partial-you-only-want-imported-once { }
-//     }
-$export-list: () !default;
-
-@mixin export-once($export-name) {
-  @if (index($export-list, $export-name) == false) {
-    $export-list: append($export-list, $export-name);
-    @content;
-  }
-}
-
-// Creates a reference for the given file in either data or package url format,
-// depending on the value of the global variable $mat-option-inline-icons.
-@function mat-icon-image($file) {
-  @if $mat-option-inline-icons {
-    @return inline-image($file)
-  } @else {
-    @return url("package:#{$file}")
-  }
-}
+@import 'package:angular_components/css/core';

angular_components/lib/css/material/const/_settings.scss

@@ -2,27 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// #############################################################################
-//
-// WARNING: DO NOT IMPORT DIRECTLY OUTSIDE OF
-// THIRD_PARTY/DART_SRC/ACX/CSS/MATERIAL
-//
-// #############################################################################
-
+@import 'package:angular_components/css/core';
 @import 'package:angular_components/css/transition_material';
 @import 'package:angular_components/css/color_material';
-
-// Options that can be set before importing
-$mat-option-inline-icons: false !default;
-$mat-option-export-classes: false !default;
-$mat-option-export-partials: false !default;
-
-// Used because of an intermittent transition bug that sometimes causes opacity
-// transitions to not execute properly if opacity starts at exactly zero.
-$almost-zero: .0001;
-$almost-one: 1 - $almost-zero;
-
-// Grid
-$mat-grid: 8px;
-$mat-grid-type: 4px;
-