Fixing memory leaks related to Tasks holding onto their callbacks.

- Switching to SwipeHelper
diff --git a/packages/SystemUI/src/com/android/systemui/recents/views/TaskView.java b/packages/SystemUI/src/com/android/systemui/recents/views/TaskView.java
index b1d0d13..9ef74ca 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/views/TaskView.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/views/TaskView.java
@@ -255,13 +255,13 @@
     }
 
     /** Actually synchronizes the model data into the views */
-    void syncToTask() {
+    private void syncToTask() {
         mThumbnailView.rebindToTask(mTask, false);
         mIconView.rebindToTask(mTask, false);
     }
 
     /** Unset the task and callback */
-    void unbindFromTask() {
+    private void unbindFromTask() {
         mTask.setCallbacks(null);
         mThumbnailView.unbindFromTask();
         mIconView.unbindFromTask();
@@ -357,16 +357,16 @@
 
     /** Enable the hw layers on this task view */
     void enableHwLayers() {
-        Console.log(Constants.DebugFlags.UI.HwLayers, "[TaskView|enableHwLayers]");
         mThumbnailView.setLayerType(View.LAYER_TYPE_HARDWARE, null);
     }
 
     /** Disable the hw layers on this task view */
     void disableHwLayers() {
-        Console.log(Constants.DebugFlags.UI.HwLayers, "[TaskView|disableHwLayers]");
         mThumbnailView.setLayerType(View.LAYER_TYPE_NONE, null);
     }
 
+    /**** TaskCallbacks Implementation ****/
+
     @Override
     public void onTaskDataChanged(Task task) {
         Console.log(Constants.DebugFlags.App.EnableBackgroundTaskLoading,
@@ -380,6 +380,16 @@
     }
 
     @Override
+    public void onTaskBound() {
+        syncToTask();
+    }
+
+    @Override
+    public void onTaskUnbound() {
+        unbindFromTask();
+    }
+
+    @Override
     public void onClick(View v) {
         mCb.onTaskIconClicked(this);
     }