Speed up All Apps -> Workspace transition

- use HW layers on Views whose alpha is faded
- don't run animation end code until the entire launcher
transition is finished
- be more aggressive about making workspace pages visible
after an animation, potential fix for Bug #5867739

Change-Id: I52a088e551c1636a67725629640286b885070f32

src/com/android/launcher2/PagedView.java

@@ -1682,6 +1682,7 @@ public abstract class PagedView extends ViewGroup {
         if (mHasScrollIndicator && mScrollIndicator == null) {
             ViewGroup parent = (ViewGroup) getParent();
             mScrollIndicator = (View) (parent.findViewById(R.id.paged_view_indicator));
+            mScrollIndicator.setLayerType(View.LAYER_TYPE_HARDWARE, null);
             mHasScrollIndicator = mScrollIndicator != null;
             if (mHasScrollIndicator) {
                 mScrollIndicator.setVisibility(View.VISIBLE);
@@ -1807,7 +1808,6 @@ public abstract class PagedView extends ViewGroup {
             indicatorPos += indicatorCenterOffset;
         }
         mScrollIndicator.setTranslationX(indicatorPos);
-        mScrollIndicator.invalidate();
     }
 
     public void showScrollIndicatorTrack() {