Implement indeterminate checkbox for the generic theme....

webkit/tools/test_shell/test_shell_webthemecontrol.cc

Index: webkit/tools/test_shell/test_shell_webthemecontrol.cc
===================================================================
--- webkit/tools/test_shell/test_shell_webthemecontrol.cc	(revision 51479)
+++ webkit/tools/test_shell/test_shell_webthemecontrol.cc	(working copy)
@@ -267,6 +267,11 @@
       nested_boxes(kCheckIndent, kCheckIndent, kCheckIndent, kCheckIndent,
                    bg_color_, fg_color_);
       break;
+    case kIndeterminateCheckBox_Type:
+      // Indeterminate checkbox is a box containing '-'.
+      nested_boxes(kCheckIndent, height_ / 2, kCheckIndent, height_ / 2,
+                   bg_color_, fg_color_);
+      break;
     case kUncheckedRadio_Type:
       circle(SkIntToScalar(half_height), bg_color_);
       break;