Set background to tabbed pane's content.

views/controls/tabbed_pane/native_tabbed_pane_gtk.cc

Index: views/controls/tabbed_pane/native_tabbed_pane_gtk.cc
===================================================================
--- views/controls/tabbed_pane/native_tabbed_pane_gtk.cc	(revision 27015)
+++ views/controls/tabbed_pane/native_tabbed_pane_gtk.cc	(working copy)
@@ -12,6 +12,8 @@
 #include "base/logging.h"
 #include "base/stl_util-inl.h"
 #include "base/string_util.h"
+#include "skia/ext/skia_utils_gtk.h"
+#include "views/background.h"
 #include "views/controls/tabbed_pane/tabbed_pane.h"
 #include "views/fill_layout.h"
 #include "views/widget/root_view.h"
@@ -129,6 +131,14 @@
   page_container->SetContentsView(contents);
   page_container->Show();
 
+  if (!contents->background()) {
+    GtkStyle* window_style =
+        gtk_widget_get_style(page_container->GetNativeView());
+    contents->set_background(
+        Background::CreateSolidBackground(
+            skia::GdkColorToSkColor(window_style->bg[GTK_STATE_NORMAL])));
+  }
+
   GtkWidget* page = page_container->GetNativeView();
 
   // increment ref count not to delete on remove below