Users stuck in fullscreen mode when running gnome-shell.

This fixes the bug by setting _GTK_HIDE_TITLEBAR_WHEN_MAXIMIZED
on the window, which causes mutter to not force fullscreen on the
window.

Owen suggested this work around.

BUG=114636
TEST=In gnome-shell, enable auto-hide panels, maximize a chrome window, then
  try toggling fullscreen on and off.

Review URL: https://chromiumcodereview.appspot.com/10388217

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@138357 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/ui/gtk/browser_window_gtk.cc

@@ -428,6 +428,11 @@ void BrowserWindowGtk::Init() {
   // Set the initial background color of widgets.
   SetBackgroundColor();
   HideUnsupportedWindowFeatures();
+
+  // Setting _GTK_HIDE_TITLEBAR_WHEN_MAXIMIZED tells gnome-shell to not force
+  // fullscreen on the window when it matches the desktop size.
+  ui::SetHideTitlebarWhenMaximizedProperty(
+      ui::GetX11WindowFromGtkWidget(GTK_WIDGET(window_)));
 }
 
 gboolean BrowserWindowGtk::OnCustomFrameExpose(GtkWidget* widget,

ui/base/x/x11_util.cc

@@ -469,6 +469,18 @@ void* GetVisualFromGtkWidget(GtkWidget* widget) {
 }
 #endif  // defined(TOOLKIT_GTK)
 
+void SetHideTitlebarWhenMaximizedProperty(XID window) {
+  uint32 hide = 1;
+  XChangeProperty(GetXDisplay(),
+      window,
+      GetAtom("_GTK_HIDE_TITLEBAR_WHEN_MAXIMIZED"),
+      XA_CARDINAL,
+      32,  // size in bits
+      PropModeReplace,
+      reinterpret_cast<unsigned char*>(&hide),
+      1);
+}
+
 int BitsPerPixelForPixmapDepth(Display* dpy, int depth) {
   int count;
   XPixmapFormatValues* formats = XListPixmapFormats(dpy, &count);

ui/base/x/x11_util.h

@@ -121,6 +121,9 @@ UI_EXPORT GtkWindow* GetGtkWindowFromX11Window(XID xid);
 UI_EXPORT void* GetVisualFromGtkWidget(GtkWidget* widget);
 #endif  // defined(TOOLKIT_GTK)
 
+// Sets _GTK_HIDE_TITLEBAR_WHEN_MAXIMIZED on |window|.
+UI_EXPORT void SetHideTitlebarWhenMaximizedProperty(XID window);
+
 // Return the number of bits-per-pixel for a pixmap of the given depth
 UI_EXPORT int BitsPerPixelForPixmapDepth(Display* display, int depth);