WinForms/Wpf.HwndHost - Add CefSharpSettings.RuntimeStyle

- Allow for configuring of the CEF RuntimeStyle globally.

Issue #4835

Author: amaitland

CefSharp.WinForms/ChromiumWebBrowser.cs

@@ -657,7 +657,7 @@ private void OnHandleDestroyedInternal()
         protected virtual IWindowInfo CreateBrowserWindowInfo(IntPtr handle)
         {
             var windowInfo = Core.ObjectFactory.CreateWindowInfo();
-            windowInfo.RuntimeStyle = CefRuntimeStyle.Alloy;
+            windowInfo.RuntimeStyle = CefSharpSettings.RuntimeStyle ?? CefRuntimeStyle.Alloy;
             windowInfo.SetAsChild(handle);
 
             if (!ActivateBrowserOnCreation)

CefSharp/CefSharpSettings.cs

@@ -81,5 +81,19 @@ static CefSharpSettings()
         /// false.
         /// </summary>
         public static bool FocusedNodeChangedEnabled { get; set; }
+
+        /// <summary>
+        /// CefSharp.WinForms and CefSharp.Wpf.HwndHost ONLY!
+        /// The default is to create <see cref="CefRuntimeStyle.Alloy"/>
+        /// styled browsers, those wanting to use <see cref="CefRuntimeStyle.Chrome"/>
+        /// styled browsers can set this property.
+        /// </summary>
+        /// <remarks>
+        /// Sets the <see cref="IWindowInfo.RuntimeStyle"/> property.
+        /// You can customise this yourself on a per browser basis
+        /// by overriding the ChromiumWebBrowser.CreateBrowserWindowInfo
+        /// property.
+        /// </remarks>
+        public static CefRuntimeStyle? RuntimeStyle { get; set; }
     }
 }