Clear bitmap cache in onResume() to make sure photos are fresh.

bc_triaged bug: http://b/issue?id=2177238
Dr. No: Tim Sullivan
diff --git a/src/com/android/contacts/ContactsListActivity.java b/src/com/android/contacts/ContactsListActivity.java
index c4e37af..e416cb7 100644
--- a/src/com/android/contacts/ContactsListActivity.java
+++ b/src/com/android/contacts/ContactsListActivity.java
@@ -750,6 +750,11 @@
     protected void onResume() {
         super.onResume();
 
+        // Force cache to reload so we don't show stale photos.
+        if (mAdapter.mBitmapCache != null) {
+            mAdapter.mBitmapCache.clear();
+        }
+
         mScrollState = OnScrollListener.SCROLL_STATE_IDLE;
         boolean runQuery = true;
         Activity parent = getParent();