Core - Add TransitionType.DirectLoad enum value (#3551)

which was added in chromiumembedded/cef@a141082

Author: campersau

CefSharp/Enums/TransitionType.cs

@@ -19,9 +19,8 @@ public enum TransitionType : uint
         LinkClicked = 0,
 
         /// <summary>
-        /// Source is some other "explicit" navigation action such as creating a new 
-        /// browser or using the LoadURL function. This is also the default value
-        /// for navigations where the actual type is unknown.
+        /// Source is some other "explicit" navigation. This is the default value for
+        /// navigations where the actual type is unknown. See also <see cref="DirectLoad"/>.
         /// </summary>
         Explicit = 1,
 
@@ -69,9 +68,15 @@ public enum TransitionType : uint
 
         /// <summary>
         /// Used the Forward or Back function to navigate among browsing history.
+        /// Will be ORed to the transition type for the original load.
         /// </summary>
         ForwardBack = 0x01000000,
 
+        /// <summary>
+        /// Loaded a URL directly via CreateBrowser, LoadURL or LoadRequest.
+        /// </summary>
+        DirectLoad = 0x02000000,
+
         /// <summary>
         /// The beginning of a navigation chain.
         /// </summary>