Add trimToSize() to public API.

Bug: 6602490
Bug: http://code.google.com/p/android/issues/detail?id=35349
Change-Id: Ib3bc7fee05bb0edc375ebee1c40a1d7bd82e2a17

Author: jsharkey

api/current.txt

@@ -22776,6 +22776,7 @@ package android.util {
     method protected int sizeOf(K, V);
     method public final synchronized java.util.Map<K, V> snapshot();
     method public final synchronized java.lang.String toString();
+    method public void trimToSize(int);
   }
 
   public final class MalformedJsonException extends java.io.IOException {

core/java/android/util/LruCache.java

@@ -186,10 +186,13 @@ public final V put(K key, V value) {
     }
 
     /**
+     * Remove the eldest entries until the total of remaining entries is at or
+     * below the requested size.
+     *
      * @param maxSize the maximum size of the cache before returning. May be -1
-     *     to evict even 0-sized elements.
+     *            to evict even 0-sized elements.
      */
-    private void trimToSize(int maxSize) {
+    public void trimToSize(int maxSize) {
         while (true) {
             K key;
             V value;