[google_maps] Set correct polyline width when building polylines.

packages/google_maps_flutter/android/src/main/java/io/flutter/plugins/googlemaps/PolylineBuilder.java

@@ -9,9 +9,11 @@
 class PolylineBuilder implements PolylineOptionsSink {
   private final PolylineOptions polylineOptions;
   private boolean consumeTapEvents;
+  private final float density;
 
-  PolylineBuilder() {
+  PolylineBuilder(float density) {
     this.polylineOptions = new PolylineOptions();
+    this.density = density;
   }
 
   PolylineOptions build() {
@@ -70,7 +72,7 @@ public void setVisible(boolean visible) {
 
   @Override
   public void setWidth(float width) {
-    polylineOptions.width(width);
+    polylineOptions.width(width * density);
   }
 
   @Override

packages/google_maps_flutter/android/src/main/java/io/flutter/plugins/googlemaps/PolylinesController.java

@@ -81,7 +81,7 @@ private void addPolyline(Object polyline) {
     if (polyline == null) {
       return;
     }
-    PolylineBuilder polylineBuilder = new PolylineBuilder();
+    PolylineBuilder polylineBuilder = new PolylineBuilder(density);
     String polylineId = Convert.interpretPolylineOptions(polyline, polylineBuilder);
     PolylineOptions options = polylineBuilder.build();
     addPolyline(polylineId, options, polylineBuilder.consumeTapEvents());