feat(cdk-experimental/combobox): created combobox file skeleton.

 (#20185)

.github/CODEOWNERS

@@ -126,6 +126,7 @@
 # CDK experimental package
 /src/cdk-experimental/*                            @jelbourn
 /src/cdk-experimental/column-resize/**             @kseamon @andrewseguin
+/src/cdk-experimental/combobox/**                  @nielsr98 @jelbourn
 /src/cdk-experimental/dialog/**                    @jelbourn @crisbeto
 /src/cdk-experimental/menu/**                      @jelbourn @andy9775
 /src/cdk-experimental/popover-edit/**              @kseamon @andrewseguin

src/cdk-experimental/combobox/BUILD.bazel

@@ -0,0 +1,12 @@
+load("//tools:defaults.bzl", "ng_module")
+
+package(default_visibility = ["//visibility:public"])
+
+ng_module(
+    name = "combobox",
+    srcs = glob(
+        ["**/*.ts"],
+        exclude = ["**/*.spec.ts"],
+    ),
+    module_name = "@angular/cdk-experimental/combobox",
+)

src/cdk-experimental/combobox/combobox-module.ts

@@ -0,0 +1,18 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {NgModule} from '@angular/core';
+import {CdkCombobox} from './combobox';
+import {CdkComboboxPanel} from './combobox-panel';
+
+const EXPORTED_DECLARATIONS = [CdkCombobox, CdkComboboxPanel];
+@NgModule({
+  exports: EXPORTED_DECLARATIONS,
+  declarations: EXPORTED_DECLARATIONS,
+})
+export class CdkComboboxModule {}

src/cdk-experimental/combobox/combobox-panel.ts

@@ -0,0 +1,17 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {Directive} from '@angular/core';
+
+@Directive({
+  selector: 'ng-template[cdkComboboxPanel]',
+  exportAs: 'cdkComboboxPanel',
+})
+export class CdkComboboxPanel<T = unknown> {
+
+}

src/cdk-experimental/combobox/combobox.ts

@@ -0,0 +1,20 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {Directive} from '@angular/core';
+
+@Directive({
+  selector: '[cdkCombobox]',
+  exportAs: 'cdkCombobox',
+  host: {
+    'role': 'combobox'
+  }
+})
+export class CdkCombobox<T = unknown> {
+
+}

src/cdk-experimental/combobox/index.ts

@@ -0,0 +1,9 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+export * from './public-api';

src/cdk-experimental/combobox/public-api.ts

@@ -0,0 +1,11 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+export * from './combobox';
+export * from './combobox-panel';
+export * from './combobox-module';

src/cdk-experimental/config.bzl

@@ -1,6 +1,7 @@
 # List of all entry-points of the Angular cdk-experimental package.
 CDK_EXPERIMENTAL_ENTRYPOINTS = [
     "column-resize",
+    "combobox",
     "dialog",
     "menu",
     "listbox",