fix(select):update implementation to use component input

Author: timmoy

src/lib/select/select.ts

@@ -184,7 +184,7 @@ export class MatSelectTrigger {}
   exportAs: 'matSelect',
   templateUrl: 'select.html',
   styleUrls: ['select.css'],
-  inputs: ['disabled', 'disableRipple', 'tabIndex'],
+  inputs: ['disabled', 'disableRipple', 'tabIndex', 'disbaleOffset'],
   encapsulation: ViewEncapsulation.None,
   preserveWhitespaces: false,
   changeDetection: ChangeDetectionStrategy.OnPush,
@@ -359,6 +359,9 @@ export class MatSelect extends _MatSelectMixinBase implements AfterContentInit,
 
     this._multiple = coerceBooleanProperty(value);
   }
+  
+  /** Whether the user wants to disable the offset. */
+  @Input () disableOffset: string = "";
 
   /**
    * A function to compare the option values with the selected values. The first argument
@@ -1120,7 +1123,7 @@ export class MatSelect extends _MatSelectMixinBase implements AfterContentInit,
     let optionOffsetFromPanelTop: number;
 
     // Disable offset for smaller lists by returning 0 as value to offset
-    if (this._getItemCount() <= maxOptionsDisplayed) {
+    if (this.disableOffset == 'true') {
       return 0;
     }