Add BytesBufferPool to prevent GC.

Change-Id: Ia8513ff380a60f102481cbf25650eca149b75064
diff --git a/src/com/android/gallery3d/app/AbstractGalleryActivity.java b/src/com/android/gallery3d/app/AbstractGalleryActivity.java
index 64c430d..eddaea5 100644
--- a/src/com/android/gallery3d/app/AbstractGalleryActivity.java
+++ b/src/com/android/gallery3d/app/AbstractGalleryActivity.java
@@ -178,6 +178,7 @@
             mGLRootView.unlockRenderThread();
         }
         MediaItem.getMicroThumbPool().clear();
+        MediaItem.getBytesBufferPool().clear();
     }
 
     @Override