feat(AgmMap): add gestureHandling option

The gestureHandling attribute in MapOptions controls how
gestures on the map are handled. The attribute takes one
of four string values (cooperative, greedy, none and auto).

Changes are not breaking, gestureHandling is an optional
attribute and the google maps api defaults this attribute to
'auto'.

Closes #919

src/core/directives/map.ts

@@ -49,7 +49,7 @@ import {DataLayerManager} from './../services/managers/data-layer-manager';
     'draggingCursor', 'keyboardShortcuts', 'zoomControl', 'zoomControlOptions', 'styles', 'usePanning',
     'streetViewControl', 'streetViewControlOptions', 'fitBounds', 'mapTypeControl', 'mapTypeControlOptions',
     'panControlOptions', 'rotateControl', 'rotateControlOptions', 'fullscreenControl', 'fullscreenControlOptions',
-    'scaleControl', 'scaleControlOptions', 'mapTypeId', 'clickableIcons'
+    'scaleControl', 'scaleControlOptions', 'mapTypeId', 'clickableIcons', 'gestureHandling'
   ],
   outputs: [
     'mapClick', 'mapRightClick', 'mapDblClick', 'centerChange', 'idle', 'boundsChange', 'zoomChange'
@@ -252,6 +252,16 @@ export class AgmMap implements OnChanges, OnInit, OnDestroy {
    */
   clickableIcons: boolean = true;
 
+  /**
+   * This setting controls how gestures on the map are handled.
+   * Allowed values:
+   * - 'cooperative' (Two-finger touch gestures pan and zoom the map. One-finger touch gestures are not handled by the map.)
+   * - 'greedy'      (All touch gestures pan or zoom the map.)
+   * - 'none'        (The map cannot be panned or zoomed by user gestures.)
+   * - 'auto'        [default] (Gesture handling is either cooperative or greedy, depending on whether the page is scrollable or not.
+   */
+  gestureHandling: 'cooperative'|'greedy'|'none'|'auto' = 'auto';
+
   /**
    * Map option attributes that can change over time
    */
@@ -261,7 +271,7 @@ export class AgmMap implements OnChanges, OnInit, OnDestroy {
     'streetViewControlOptions', 'zoom', 'mapTypeControl', 'mapTypeControlOptions', 'minZoom',
     'maxZoom', 'panControl', 'panControlOptions', 'rotateControl', 'rotateControlOptions',
     'fullscreenControl', 'fullscreenControlOptions', 'scaleControl', 'scaleControlOptions',
-    'mapTypeId', 'clickableIcons'
+    'mapTypeId', 'clickableIcons', 'gestureHandling'
   ];
 
   private _observableSubscriptions: Subscription[] = [];
@@ -343,7 +353,8 @@ export class AgmMap implements OnChanges, OnInit, OnDestroy {
       fullscreenControl: this.fullscreenControl,
       fullscreenControlOptions: this.fullscreenControlOptions,
       mapTypeId: this.mapTypeId,
-      clickableIcons: this.clickableIcons
+      clickableIcons: this.clickableIcons,
+      gestureHandling: this.gestureHandling
     });
 
     // register event listeners

src/core/services/google-maps-types.ts

@@ -148,6 +148,7 @@ export interface MapOptions {
   fullscreenControlOptions?: FullscreenControlOptions;
   mapTypeId?: string|MapTypeId;
   clickableIcons?: boolean;
+  gestureHandling?: 'cooperative'|'greedy'|'none'|'auto';
 }
 
 export interface MapTypeStyle {