Repository: flutter
Issue: google_maps is not drawing customized Polyline on iOS
Labels: platform-ios,p: maps,package,has reproducible steps,P2,found in release: 1.22,found in release: 1.26,found in release: 2.0,found in release: 2.3,team-ios,triaged-ios

I'm using the following style of Polyline to draw one the google_maps

```
Polyline(
          polylineId: PolylineId("${polylineId++}"),
          width: 4,
          points: points,
          patterns: isWalking
              ? path
                  .map(
                    (_) => PatternItem.dot,
                  )
                  .toList()
              : [],
          color: ColorRes.colorSecondaryLight,
          jointType: JointType.round,
          startCap: Cap.roundCap,
          endCap: Cap.roundCap,
        )
```

The Polyline appears normal on Android, but it uses the default style on iOS (like I didn't use any styling)
It draws the Polyline, just not using any customizations.

Flutter Doctor :

<details> 
<summary>flutter doctor -v</summary> 

```console
[✓] Flutter (Channel stable, v1.17.4, on Mac OS X 10.15.4 19E287, locale en-SY)
    • Flutter version 1.17.4 at /Users/ucgmacmini/Library/flutter
    • Framework revision 1ad9baa8b9 (6 days ago), 2020-06-17 14:41:16 -0700
    • Engine revision ee76268252
    • Dart version 2.8.4

 
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.0-rc1)
    • Android SDK at /Users/ucgmacmini/Library/Android/sdk
    • Platform android-30, build-tools 30.0.0-rc1
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 11.3.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 11.3.1, Build version 11C505
    • CocoaPods version 1.9.1

[✓] Android Studio (version 4.0)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 46.0.2
    • Dart plugin version 193.7361
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)

[!] IntelliJ IDEA Community Edition (version 2020.1.2)
    • IntelliJ at /Applications/IntelliJ IDEA CE.app
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
    • For information about installing plugins, see
      https://flutter.dev/intellij-setup/#installing-the-plugins

[!] VS Code (version 1.45.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    ✗ Flutter extension not installed; install from
      https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter

[✓] Connected device (2 available)
    • Android SDK built for x86 • emulator-5554                        • android-x86 • Android 10 (API 29) (emulator)
    • iPhone 11 Pro             • 7CF0AEC0-6B2F-4EDA-9C70-5941AE459EED • ios         • com.apple.CoreSimulator.SimRuntime.iOS-13-3 (simulator)

! Doctor found issues in 2 categories.
```
		
</details>
google_maps : v0.5.28+1

I've tested on an Emulator and on a Physical Device