Unifying overscroll btw phone and tablet

-> Using separate assets for removing and uninstalling

Change-Id: I183967c3ca482531ae28f71cd9053b673c6a8d03

src/com/android/launcher2/CellLayout.java

@@ -36,7 +36,6 @@ import android.graphics.PorterDuff;
 import android.graphics.PorterDuffXfermode;
 import android.graphics.Rect;
 import android.graphics.RectF;
-import android.graphics.Region;
 import android.graphics.drawable.Drawable;
 import android.graphics.drawable.NinePatchDrawable;
 import android.util.AttributeSet;
@@ -72,6 +71,7 @@ public class CellLayout extends ViewGroup {
     private int mWidthGap;
     private int mHeightGap;
     private int mMaxGap;
+    private boolean mScrollingTransformsDirty = false;
 
     private final Rect mRect = new Rect();
     private final CellInfo mCellInfo = new CellInfo();
@@ -345,6 +345,23 @@ public class CellLayout extends ViewGroup {
         return mIsDragOverlapping;
     }
 
+    protected void setOverscrollTransformsDirty(boolean dirty) {
+        mScrollingTransformsDirty = dirty;
+    }
+
+    protected void resetOverscrollTransforms() {
+        if (mScrollingTransformsDirty) {
+            setOverscrollTransformsDirty(false);
+            setTranslationX(0);
+            setRotationY(0);
+            // It doesn't matter if we pass true or false here, the important thing is that we
+            // pass 0, which results in the overscroll drawable not being drawn any more.
+            setOverScrollAmount(0, false);
+            setPivotX(getMeasuredWidth() / 2);
+            setPivotY(getMeasuredHeight() / 2);
+        }
+    }
+
     @Override
     protected void onDraw(Canvas canvas) {
         // When we're large, we are either drawn in a "hover" state (ie when dragging an item to