WinForms - Add ChromiumWebBrowser.FromBrowser static method

- Can be used to get ChromiumWebBrowser instance from IBrowser instance
- Added generic base implementation to reduce code duplication

Author: amaitland

CefSharp.WinForms/ChromiumWebBrowser.cs

@@ -789,5 +789,16 @@ public IBrowser GetBrowser()
 
             return browser;
         }
+
+        /// <summary>
+        /// Gets the <see cref="ChromiumWebBrowser"/> associated with
+        /// a specific <see cref="IBrowser"/> instance. 
+        /// </summary>
+        /// <param name="browser">browser</param>
+        /// <returns>returns the assocaited <see cref="ChromiumWebBrowser"/> or null if Disposed or no host found.</returns>
+        public static ChromiumWebBrowser FromBrowser(IBrowser browser)
+        {
+            return FromBrowser<ChromiumWebBrowser>(browser);
+        }
     }
 }

CefSharp.WinForms/Host/ChromiumHostControl.cs

@@ -298,21 +298,7 @@ protected override void Dispose(bool disposing)
         /// <returns>returns the assocaited <see cref="ChromiumHostControl"/> or null if Disposed or no host found.</returns>
         public static ChromiumHostControl FromBrowser(IBrowser browser)
         {
-            if (browser.IsDisposed)
-            {
-                return null;
-            }
-
-            var windowHandle = browser.GetHost().GetWindowHandle();
-
-            if (windowHandle == IntPtr.Zero)
-            {
-                return null;
-            }
-
-            var control = Control.FromChildHandle(windowHandle) as ChromiumHostControl;
-
-            return control;
+            return FromBrowser<ChromiumHostControl>(browser);
         }
     }
 }

CefSharp.WinForms/Host/ChromiumHostControlBase.cs

@@ -181,5 +181,30 @@ internal void RaiseIsBrowserInitializedChangedEvent()
         {
             IsBrowserInitializedChanged?.Invoke(this, EventArgs.Empty);
         }
+
+        /// <summary>
+        /// Gets the <see cref="ChromiumHostControl"/> or <see cref="ChromiumWebBrowser"/> associated with
+        /// a specific <see cref="IBrowser"/> instance. 
+        /// </summary>
+        /// <param name="browser">browser</param>
+        /// <returns>returns the assocaited <see cref="ChromiumHostControl"/> or <see cref="ChromiumWebBrowser"/> or null if Disposed or no host found.</returns>
+        internal static T FromBrowser<T>(IBrowser browser) where T : ChromiumHostControlBase
+        {
+            if (browser.IsDisposed)
+            {
+                return null;
+            }
+
+            var windowHandle = browser.GetHost().GetWindowHandle();
+
+            if (windowHandle == IntPtr.Zero)
+            {
+                return null;
+            }
+
+            var control = Control.FromChildHandle(windowHandle) as T;
+
+            return control;
+        }
     }
 }