fix(MatPaginatorIntl): Provide a provider if exists. (#7895)

* fix(MatPaginatorIntl): Provide a provider if exists.

If there is already a MatPaginatorIntl provider that one
If not create a new instance.

Closes #7344

* style(paginator): Changed arguments, removed spacing

* style(paginator): Changed argument name.

Author: Jefiozie

src/lib/paginator/paginator-intl.ts

@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {Injectable} from '@angular/core';
+import {Injectable, SkipSelf, Optional } from '@angular/core';
 import {Subject} from 'rxjs/Subject';
 
 /**
@@ -46,3 +46,16 @@ export class MatPaginatorIntl {
     return `${startIndex + 1} - ${endIndex} of ${length}`;
   }
 }
+
+/** @docs-private */
+export function MAT_PAGINATOR_INTL_PROVIDER_FACTORY(parentIntl: MatPaginatorIntl) {
+  return parentIntl || new MatPaginatorIntl();
+}
+
+/** @docs-private */
+export const MAT_PAGINATOR_INTL_PROVIDER = {
+  // If there is already an MatPaginatorIntl available, use that. Otherwise, provide a new one.
+  provide: MatPaginatorIntl,
+  deps: [[new Optional(), new SkipSelf(), MatPaginatorIntl]],
+  useFactory: MAT_PAGINATOR_INTL_PROVIDER_FACTORY
+};

src/lib/paginator/paginator-module.ts

@@ -12,7 +12,7 @@ import {MatButtonModule} from '@angular/material/button';
 import {MatSelectModule} from '@angular/material/select';
 import {MatTooltipModule} from '@angular/material/tooltip';
 import {MatPaginator} from './paginator';
-import {MatPaginatorIntl} from './paginator-intl';
+import {MAT_PAGINATOR_INTL_PROVIDER} from './paginator-intl';
 
 
 @NgModule({
@@ -24,6 +24,6 @@ import {MatPaginatorIntl} from './paginator-intl';
   ],
   exports: [MatPaginator],
   declarations: [MatPaginator],
-  providers: [MatPaginatorIntl],
+  providers: [MAT_PAGINATOR_INTL_PROVIDER],
 })
 export class MatPaginatorModule {}