Change TransitionType to an unit enum

Add [Falgs] attribute as TransitionType can have multiple values
Import values from cef_transition_type_t (cef_types.h)
Rename some of the values (slightly friendlier names)

Author: amaitland

CefSharp/TransitionType.cs

@@ -1,12 +1,98 @@
-namespace CefSharp
+using System;
+
+namespace CefSharp
 {
-	public enum TransitionType
+	[Flags]
+	public enum TransitionType : uint
 	{
-		LinkClicked,
-		FormSubmitted,
-		BackForward,
-		Reload,
-		FormResubmitted,
-		Other
+		/// <summary>
+		/// Source is a link click or the JavaScript window.open function. This is
+		/// also the default value for requests like sub-resource loads that are not navigations.
+		/// </summary>
+		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.
+		/// </summary>
+		Explicit = 1,
+
+		/// <summary>
+		/// Source is a subframe navigation. This is any content that is automatically
+		/// loaded in a non-toplevel frame. For example, if a page consists of several
+		/// frames containing ads, those ad URLs will have this transition type.
+		/// The user may not even realize the content in these pages is a separate
+		/// frame, so may not care about the URL.
+		/// </summary>
+		AutoSubFrame = 3,
+
+		/// <summary>
+		/// Source is a subframe navigation explicitly requested by the user that will
+		/// generate new navigation entries in the back/forward list. These are
+		/// probably more important than frames that were automatically loaded in
+		/// the background because the user probably cares about the fact that this
+		/// link was loaded.
+		/// </summary>
+		ManualSubFrame = 4,
+
+		/// <summary>
+		/// Source is a form submission by the user. NOTE: In some situations
+		/// submitting a form does not result in this transition type. This can happen
+		/// if the form uses a script to submit the contents.
+		/// </summary>
+		FormSubmit = 7,
+
+		/// <summary>
+		/// Source is a "reload" of the page via the Reload function or by re-visiting
+		/// the same URL. NOTE: This is distinct from the concept of whether a
+		/// particular load uses "reload semantics" (i.e. bypasses cached data).
+		/// </summary>
+		Reload = 8,
+
+		/// <summary>
+		/// General mask defining the bits used for the source values.
+		/// </summary>
+		SourceMask = 0xFF,
+
+		/// <summary>
+		/// Attempted to visit a URL but was blocked.
+		/// </summary>
+		Blocked = 0x00800000,
+
+		/// <summary>
+		/// Used the Forward or Back function to navigate among browsing history.
+		/// </summary>
+		ForwardBack = 0x01000000,
+
+		/// <summary>
+		/// The beginning of a navigation chain.
+		/// </summary>
+		ChainStart = 0x10000000,
+
+		/// <summary>
+		/// The last transition in a redirect chain.
+		/// </summary>
+		ChainEnd = 0x20000000,
+
+		/// <summary>
+		/// Redirects caused by JavaScript or a meta refresh tag on the page.
+		/// </summary>
+		CliendRedirect = 0x40000000,
+
+		/// <summary>
+		/// Redirects sent from the server by HTTP headers.
+		/// </summary>
+		ServerRedirect = 0x80000000,
+
+		/// <summary>
+		/// Used to test whether a transition involves a redirect.
+		/// </summary>
+		IsRedirect = 0xC0000000,
+
+		/// <summary>
+		/// General mask defining the bits used for the qualifiers.
+		/// </summary>
+		QualifierMask = 0xFFFFFF00
 	};
 }