Change windows messages api to hook instead of emitter

docs/api/browser-window.md

@@ -232,10 +232,6 @@ Emitted when the window enters full screen state triggered by html api.
 
 Emitted when the window leaves full screen state triggered by html api.
 
-### Event: 'message' _WINDOWS_
-
-Emitted when the window receives a message from the operating system.
-
 ### Event: 'app-command':
 
 Emitted when an [App Command](https://msdn.microsoft.com/en-us/library/windows/desktop/ms646275(v=vs.85).aspx)
@@ -556,6 +552,30 @@ Enters or leaves the kiosk mode.
 
 Returns whether the window is in kiosk mode.
 
+### `win.hookWindowMessage(message, callback)` _WINDOWS_
+
+* `message` Integer
+* `callback` Function
+
+Hooks a windows message. The `callback` is called when
+the message is received in the WndProc.
+
+### `win.isWindowMessageHooked(message)` _WINDOWS_
+
+* `message` Integer
+
+Returns `true` or `false` depending on whether the message is hooked.
+
+### `win.unhookWindowMessage(message)` _WINDOWS_
+
+* `message` Integer
+
+Unhook the window message.
+
+### `win.unhookAllWindowMessages()` _WINDOWS_
+
+Unhooks all of the window messages.
+
 ### `win.setRepresentedFilename(filename)` _OS X_
 
 * `filename` String