Move State to base and root stuff to roots.

And move Shared to base.
And lots more to base.

Change-Id: I8b01264a329473c13c59f0cd25a320ba73dbd82d
diff --git a/src/com/android/documentsui/ThumbnailCache.java b/src/com/android/documentsui/ThumbnailCache.java
index 639d4fb..cfa5357 100644
--- a/src/com/android/documentsui/ThumbnailCache.java
+++ b/src/com/android/documentsui/ThumbnailCache.java
@@ -26,6 +26,8 @@
 import android.util.Pair;
 import android.util.Pools;
 
+import com.android.documentsui.base.Shared;
+
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.util.Comparator;