Add missing views class names

ui/views/controls/slider.cc

Index: ui/views/controls/slider.cc
diff --git a/ui/views/controls/slider.cc b/ui/views/controls/slider.cc
index f1d2bc34915c4c532753d10648c33971a85682a4..b5c71c2451f37e235724827b082a3329fd9dc626 100644
--- a/ui/views/controls/slider.cc
+++ b/ui/views/controls/slider.cc
@@ -51,6 +51,9 @@ enum BorderElements {
 
 namespace views {
 
+// static
+const char Slider::kViewClassName[] = "Slider";
+
 Slider::Slider(SliderListener* listener, Orientation orientation)
     : listener_(listener),
       orientation_(orientation),
@@ -186,6 +189,10 @@ void Slider::OnPaintFocus(gfx::Canvas* canvas) {
   }
 }
 
+const char* Slider::GetClassName() const {
+  return kViewClassName;
+}
+
 gfx::Size Slider::GetPreferredSize() const {
   const int kSizeMajor = 200;
   const int kSizeMinor = 40;