Multiple performance changes to speed recents invocation/app launching time. (Bug 16987565)

- Reverting changes to the existing thumbnail transition to prevent breaking applications
  that currently depend on that transition.  As a result, we need to create a new, hidden,
  aspect-scaled thumbnail transition, and instead use that thumbnail to animate the
  recents header so that we don't have to wait to do that inside the Recents activity.

  In order for this to work, we also have to ensure that the thumbnail surface destruction
  is synchronized with the application that is currently closing (when going down to
  recents) or opening (when coming back up).  The current thumbnail is destroyed when the
  animation ends, but that can be at least 1 frame before the surface for the animating
  window is destroyed.  We change this by deferring destruction of this thumbnail window
  to the animation that is being closed.

  Especially on the way up, not having to wait for us to hide the header before doing the
  transition up can save us the duration of that first animation (> 100ms).

- Other optimizations:
  * No longer creating a new stack view on each transition to calculate the target rect
  * Removing unnecessary call to get the thumbnail when transitioning up/down (the actual
    window does its own animation.
  * We reduced numerous system calls per task by adding a flag to ignore home-stack tasks
    and caching the activity label and icon (and task description icon).  These caches
    follow the same eviction schemes as the thumbnail and icon cache.

- Also tweaked the touch slop for the nav bar swiping gesture to prevent conflicting with
  tapping on home (Bug 17109581)

Change-Id: Ica697aad788051a9203edd9351c583e1cb038a71

1 files changed, 6 insertions, 0 deletions

diff --git a/tools/layoutlib/bridge/src/android/view/IWindowManagerImpl.java b/tools/layoutlib/bridge/src/android/view/IWindowManagerImpl.java
index f8bc2ae..2604e97 100644
--- a/tools/layoutlib/bridge/src/android/view/IWindowManagerImpl.java
+++ b/tools/layoutlib/bridge/src/android/view/IWindowManagerImpl.java
@@ -221,6 +221,12 @@ public class IWindowManagerImpl implements IWindowManager {
     }
 
     @Override
+    public void overridePendingAppTransitionAspectScaledThumb(Bitmap srcThumb, int startX,
+            int startY, IRemoteCallback startedCallback, boolean scaleUp) {
+        // TODO Auto-generated method stub
+    }
+
+    @Override
     public void pauseKeyDispatching(IBinder arg0) throws RemoteException {
         // TODO Auto-generated method stub