Show gray tile for screennails not loaded yet.

Bug: 6452217
Change-Id: Ied9c2e2c91f4ffe218a73ba1a123df92a2aab98a
diff --git a/src/com/android/gallery3d/ui/PositionController.java b/src/com/android/gallery3d/ui/PositionController.java
index 9797ce9..226826d 100644
--- a/src/com/android/gallery3d/ui/PositionController.java
+++ b/src/com/android/gallery3d/ui/PositionController.java
@@ -34,6 +34,8 @@
     public static final int IMAGE_AT_TOP_EDGE = 4;
     public static final int IMAGE_AT_BOTTOM_EDGE = 8;
 
+    public static final int CAPTURE_ANIMATION_TIME = 600;
+
     // Special values for animation time.
     private static final long NO_ANIMATION = -1;
     private static final long LAST_ANIMATION = -2;
@@ -56,7 +58,7 @@
         300,  // ANIM_KIND_ZOOM
         400,  // ANIM_KIND_OPENING
         0,    // ANIM_KIND_FLING (the duration is calculated dynamically)
-        800,  // ANIM_KIND_CAPTURE
+        CAPTURE_ANIMATION_TIME,  // ANIM_KIND_CAPTURE
     };
 
     // We try to scale up the image to fill the screen. But in order not to