GTK: Port RenderWidgetHostViewGtk to latest GTK

ui/base/gtk/gtk_compat.h

Index: ui/base/gtk/gtk_compat.h
diff --git a/ui/base/gtk/gtk_compat.h b/ui/base/gtk/gtk_compat.h
index e6c119a286e804f2ca6d8cf93a5e78d9559ce252..b9f7fd2a0ba8c89c2c0caece901323fa555382be 100644
--- a/ui/base/gtk/gtk_compat.h
+++ b/ui/base/gtk/gtk_compat.h
@@ -26,14 +26,32 @@ inline gboolean gtk_widget_is_toplevel(GtkWidget* widget) {
 }
 #endif
 
+#if !GTK_CHECK_VERSION(2, 22, 0)
+inline gint gdk_visual_get_depth(GdkVisual* visual) {
+  return visual->depth;
+}
+#endif
+
 #if !GTK_CHECK_VERSION(2, 24, 0)
 inline void gdk_pixmap_get_size(GdkPixmap* pixmap, gint* width, gint* height) {
   gdk_drawable_get_size(GDK_DRAWABLE(pixmap), width, height);
 }
 
+inline int gdk_window_get_height(GdkWindow* window) {
+  int height;
+  gdk_drawable_get_size(GDK_DRAWABLE(window), NULL, &height);
+  return height;
+}
+
 inline GdkScreen* gdk_window_get_screen(GdkWindow* window) {
   return gdk_drawable_get_screen(GDK_DRAWABLE(window));
 }
+
+inline int gdk_window_get_width(GdkWindow* window) {
+  int width;
+  gdk_drawable_get_size(GDK_DRAWABLE(window), &width, NULL);
+  return width;
+}
 #endif
 
 #endif  // UI_BASE_GTK_GTK_COMPAT_H_