2941 [google_maps_flutter] fix to properly place polyline at initial camera position in example app (cla: yes, waiting for tree to go green)

2943 [google_sign_in_web] Ensure web plugin throws PlatformExceptions (cla: yes)

2986 [integration_test] Recommend tests to be in integration_test/, fix example (cla: yes)

2988 [shared_preferences] Add shared_preferences_windows (cla: yes)

2991 [webview_flutter] [url_launcher] Handle Multiwindows in WebViews  (cla: yes)

2995 [file_selector_platform_interface] Add platform interface for new file_selector plugin (cla: yes)

2998 [google_maps_flutter_web] Allow Markers with icon:null (cla: yes)