Fix issue 19785: Chrome enters full-screen mode when a maximized window is mo...

chrome/browser/gtk/browser_window_gtk.h

Index: chrome/browser/gtk/browser_window_gtk.h
===================================================================
--- chrome/browser/gtk/browser_window_gtk.h	(revision 23948)
+++ chrome/browser/gtk/browser_window_gtk.h	(working copy)
@@ -376,6 +376,22 @@
   // The accelerator group used to handle accelerators, owned by this object.
   GtkAccelGroup* accel_group_;
 
+  // Whether SetFullscreen(true) was called, indicating if we really want to be
+  // in fullscreen mode. We should only be in fullscreen mode when both
+  // |set_fullscreen_| and (|state_| & GDK_WWINDOW_STATE_FULLSCREEN) are true,
+  // because following situations might occur:
+  // 1. Window Manager doesn't support fullscreen mode, so that
+  //    (|state_| & GDK_WWINDOW_STATE_FULLSCREEN) will always be false.
+  // 2. Window Manager may turn our window into fullscreen mode automatically,
+  //    when we do not really want.
+  bool set_fullscreen_;
+
+  // Indicates if we are really in fullscreen mode, that's both
+  // |set_fullscreen_| and (|state_| & GDK_WWINDOW_STATE_FULLSCREEN) are true.
+  // We track it instead of checking above two values every time to make sure we
+  // only do interface adjustment when necessary.
+  bool fullscreen_;
+
   DISALLOW_COPY_AND_ASSIGN(BrowserWindowGtk);
 };