Desktop Aura: Allow tab drags out of window.

base/message_pump_aurax11.h

Index: base/message_pump_aurax11.h
diff --git a/base/message_pump_aurax11.h b/base/message_pump_aurax11.h
index 1f860040791c85d4f2ba56cc6705bd9b3a0e1b7c..9dd8c40b587ecfef72936f68058665319ce0af20 100644
--- a/base/message_pump_aurax11.h
+++ b/base/message_pump_aurax11.h
@@ -13,6 +13,11 @@
 
 #include <bitset>
 
+// It would be nice to including X11 headers here so that we use Window instead
+// of its typedef of unsigned long, but we can't because everything in chrome
+// includes us through base/message_loop.h, and X11's crappy #define heavy
+// headers muck up half of chrome.
+
 typedef struct _GPollFD GPollFD;
 typedef struct _GSource GSource;
 typedef struct _XDisplay Display;
@@ -33,10 +38,24 @@ class BASE_EXPORT MessagePumpAuraX11 : public MessagePumpGlib {
   // Sets the default dispatcher to process native events.
   static void SetDefaultDispatcher(MessagePumpDispatcher* dispatcher);
 
+  // Returns the UI message pump.
+  static MessagePumpAuraX11* Current();
+
   // Internal function. Called by the glib source dispatch function. Processes
   // all available X events.
   bool DispatchXEvents();
 
+  // Blocks on the X11 event queue until we receive notification from the
+  // xserver that |w| has been mapped; events on |w| are pulled out from the
+  // queue and dispatched out of order.
+  //
+  // For those that know X11, this is really a wrapper around XWindowEvent
+  // which still makes sure the preempted event is dispatched instead of
+  // dropped on the floor. This method exists because mapping a window is
+  // asynchronous (and we receive an XEvent when mapped), while there are also
+  // functions which require a mapped window.
+  void BlockUntilWindowMapped(unsigned long w);
+
  protected:
   virtual ~MessagePumpAuraX11();