Implemented visual speed-bump for notifications.

The separation between the important and the less important
notifications has now a visual representation.

Bug: 14607473
Change-Id: I8baa0a08924ec041be2884a2834139477313ab40
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/stack/AmbientState.java b/packages/SystemUI/src/com/android/systemui/statusbar/stack/AmbientState.java
index deab757..b21e12c 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/stack/AmbientState.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/stack/AmbientState.java
@@ -30,6 +30,7 @@
     private View mActivatedChild;
     private float mOverScrollTopAmount;
     private float mOverScrollBottomAmount;
+    private int mSpeedBumpIndex = -1;
 
     public int getScrollY() {
         return mScrollY;
@@ -86,4 +87,12 @@
     public float getOverScrollAmount(boolean top) {
         return top ? mOverScrollTopAmount : mOverScrollBottomAmount;
     }
+
+    public int getSpeedBumpIndex() {
+        return mSpeedBumpIndex;
+    }
+
+    public void setSpeedBumpIndex(int speedBumpIndex) {
+        mSpeedBumpIndex = speedBumpIndex;
+    }
 }