diff -r 000000000000 -r 6474c204b198 mobile/android/base/home/PanelAuthCache.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mobile/android/base/home/PanelAuthCache.java	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,82 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.gecko.home;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
+import android.util.Log;
+
+import org.mozilla.gecko.GeckoSharedPrefs;
+
+/**
+ * Cache used to store authentication state of dynamic panels. The values
+ * in this cache are set in JS through the Home.panels API.
+ *
+ * {@code DynamicPanel} uses this cache to determine whether or not to
+ * show authentication UI for dynamic panels, including listening for
+ * changes in authentication state.
+ */
+class PanelAuthCache {
+    private static final String LOGTAG = "GeckoPanelAuthCache";
+
+    // Keep this in sync with the constant defined in Home.jsm
+    private static final String PREFS_PANEL_AUTH_PREFIX = "home_panels_auth_";
+
+    private final Context mContext;
+    private SharedPrefsListener mSharedPrefsListener;
+    private OnChangeListener mChangeListener;
+
+    public interface OnChangeListener {
+        public void onChange(String panelId, boolean isAuthenticated);
+    }
+
+    public PanelAuthCache(Context context) {
+        mContext = context;
+    }
+
+    private SharedPreferences getSharedPreferences() {
+        return GeckoSharedPrefs.forProfile(mContext);
+    }
+
+    private String getPanelAuthKey(String panelId) {
+        return PREFS_PANEL_AUTH_PREFIX + panelId;
+    }
+
+    public boolean isAuthenticated(String panelId) {
+        final SharedPreferences prefs = getSharedPreferences();
+        return prefs.getBoolean(getPanelAuthKey(panelId), false);
+    }
+
+    public void setOnChangeListener(OnChangeListener listener) {
+        final SharedPreferences prefs = getSharedPreferences();
+
+        if (mChangeListener != null) {
+            prefs.unregisterOnSharedPreferenceChangeListener(mSharedPrefsListener);
+            mSharedPrefsListener = null;
+        }
+
+        mChangeListener = listener;
+
+        if (mChangeListener != null) {
+            mSharedPrefsListener = new SharedPrefsListener();
+            prefs.registerOnSharedPreferenceChangeListener(mSharedPrefsListener);
+        }
+    }
+
+    private class SharedPrefsListener implements OnSharedPreferenceChangeListener {
+        @Override
+        public void onSharedPreferenceChanged(SharedPreferences prefs, String key) {
+            if (key.startsWith(PREFS_PANEL_AUTH_PREFIX)) {
+                final String panelId = key.substring(PREFS_PANEL_AUTH_PREFIX.length());
+                final boolean isAuthenticated = prefs.getBoolean(key, false);
+
+                Log.d(LOGTAG, "Auth state changed: panelId=" + panelId + ", isAuthenticated=" + isAuthenticated);
+                mChangeListener.onChange(panelId, isAuthenticated);
+            }
+        }
+    }
+}