Add new attention state to launcher

ash/launcher/launcher_button.h

Index: ash/launcher/launcher_button.h
diff --git a/ash/launcher/launcher_button.h b/ash/launcher/launcher_button.h
index d5fe8b8f067e6d9ea1b4c7624b9565c7b07edf75..e1278b8d462d817a393ccf51d72e81c581967cc1 100644
--- a/ash/launcher/launcher_button.h
+++ b/ash/launcher/launcher_button.h
@@ -19,10 +19,11 @@ class LauncherButton : public views::CustomButton {
  public:
   // Used to indicate the current state of the button.
   enum State {
-    STATE_NORMAL  = 0,
-    STATE_HOVERED = 1 << 0,
-    STATE_RUNNING = 1 << 1,
-    STATE_ACTIVE  = 1 << 2
+    STATE_NORMAL    = 0,
+    STATE_HOVERED   = 1 << 0,
+    STATE_RUNNING   = 1 << 1,
+    STATE_ACTIVE    = 1 << 2,
+    STATE_ATTENTION = 1 << 3,
   };
 
   virtual ~LauncherButton();
@@ -86,6 +87,7 @@ class LauncherButton : public views::CustomButton {
   LauncherButtonHost* host() const { return host_; }
 
  private:
+  class BarView;
   // Updates the parts of the button to reflect the current state_. This may
   // add or remove views, layout and paint.
   void UpdateState();
@@ -93,7 +95,7 @@ class LauncherButton : public views::CustomButton {
   LauncherButtonHost* host_;
   IconView* icon_view_;
   // Draws a bar underneath the image to represent the state of the application.
-  views::ImageView* bar_;
+  BarView* bar_;
   // The current state of the application, multiple values of AppState are or'd
   // together.
   int state_;