Gallery2: Increase the size of the tiles when decoding images

BitmapRegionDecoder was refactored in Android N [1] and bigger tiles
are now better to render images, so increase the size of each tile.

[1] https://issuetracker.google.com/issues/37136991#comment11

BUGBASH-188
BUGBASH-299

Change-Id: Ie9c282fc5a98c9da6bb8ae3bcfe869b8b422a84b
diff --git a/src/com/android/photos/views/TiledImageRenderer.java b/src/com/android/photos/views/TiledImageRenderer.java
index c4e493b..58bfdbb 100644
--- a/src/com/android/photos/views/TiledImageRenderer.java
+++ b/src/com/android/photos/views/TiledImageRenderer.java
@@ -159,7 +159,7 @@
     }
 
     public static int suggestedTileSize(Context context) {
-        return isHighResolution(context) ? 512 : 256;
+        return isHighResolution(context) ? 2048 : 1024;
     }
 
     private static boolean isHighResolution(Context context) {