Refactor the glib message-pump, and use it as the base for a gtk message pump and an X message pump.

The changes:
 * Rename MessagePumpGlibX to MessagePumpX.
 * Rename MessagePumpForUI to MessagePumpGlib.
 * Move some stuff out of MessagePumpGlib, and into MessagePumpGtk and MessagePumpX.
 * Rename MessagePumpForUI::Observer to MessageObserver, moved the platform-specific implementations into MessagePumpGtk and MessagePumpX. Ditto for MessagePumpForUI::Dispatcher.

MessagePumpX is independent of MessagePumpGtk. At the moment, MessagePumpX does process some GDK event, but once we have a complete native_widget_x, we can take out the GDK processing and things should continue to work.

BUG=none
TEST=existing message-pump tests.

Review URL: http://codereview.chromium.org/7250001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@90418 0039d316-1c4b-4281-b951-d872f2087c98


CrOS-Libchrome-Original-Commit: 2047ef4d68229d47cba8bf7f2e0465ab31f8b3ce
diff --git a/base/message_loop.cc b/base/message_loop.cc
index b0526f4..e45c0d7 100644
--- a/base/message_loop.cc
+++ b/base/message_loop.cc
@@ -25,14 +25,16 @@
 #if defined(OS_POSIX)
 #include "base/message_pump_libevent.h"
 #endif
+
 #if defined(OS_POSIX) && !defined(OS_MACOSX)
 #include <gdk/gdk.h>
 #include <gdk/gdkx.h>
-#include "base/message_pump_glib.h"
-#endif
 #if defined(TOUCH_UI)
-#include "base/message_pump_glib_x.h"
-#endif
+#include "base/message_pump_x.h"
+#else
+#include "base/message_pump_gtk.h"
+#endif  // defined(TOUCH_UI)
+#endif  // defined(OS_POSIX) && !defined(OS_MACOSX)
 
 using base::TimeDelta;
 using base::TimeTicks;
@@ -176,7 +178,7 @@
 #define MESSAGE_PUMP_UI base::MessagePumpMac::Create()
 #define MESSAGE_PUMP_IO new base::MessagePumpLibevent()
 #elif defined(TOUCH_UI)
-#define MESSAGE_PUMP_UI new base::MessagePumpGlibX()
+#define MESSAGE_PUMP_UI new base::MessagePumpX()
 #define MESSAGE_PUMP_IO new base::MessagePumpLibevent()
 #elif defined(OS_NACL)
 // Currently NaCl doesn't have a UI or an IO MessageLoop.
@@ -184,7 +186,7 @@
 #define MESSAGE_PUMP_UI NULL
 #define MESSAGE_PUMP_IO NULL
 #elif defined(OS_POSIX)  // POSIX but not MACOSX.
-#define MESSAGE_PUMP_UI new base::MessagePumpForUI()
+#define MESSAGE_PUMP_UI new base::MessagePumpGtk()
 #define MESSAGE_PUMP_IO new base::MessagePumpLibevent()
 #else
 #error Not implemented