diff -r 000000000000 -r 6474c204b198 mobile/android/base/ZoomConstraints.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mobile/android/base/ZoomConstraints.java	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,53 @@
+/* -*- 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;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+public final class ZoomConstraints {
+    private final boolean mAllowZoom;
+    private final boolean mAllowDoubleTapZoom;
+    private final float mDefaultZoom;
+    private final float mMinZoom;
+    private final float mMaxZoom;
+
+    public ZoomConstraints(boolean allowZoom) {
+        mAllowZoom = allowZoom;
+        mAllowDoubleTapZoom = allowZoom;
+        mDefaultZoom = 0.0f;
+        mMinZoom = 0.0f;
+        mMaxZoom = 0.0f;
+    }
+
+    ZoomConstraints(JSONObject message) throws JSONException {
+        mAllowZoom = message.getBoolean("allowZoom");
+        mAllowDoubleTapZoom = message.getBoolean("allowDoubleTapZoom");
+        mDefaultZoom = (float)message.getDouble("defaultZoom");
+        mMinZoom = (float)message.getDouble("minZoom");
+        mMaxZoom = (float)message.getDouble("maxZoom");
+    }
+
+    public final boolean getAllowZoom() {
+        return mAllowZoom;
+    }
+
+    public final boolean getAllowDoubleTapZoom() {
+        return mAllowDoubleTapZoom;
+    }
+
+    public final float getDefaultZoom() {
+        return mDefaultZoom;
+    }
+
+    public final float getMinZoom() {
+        return mMinZoom;
+    }
+
+    public final float getMaxZoom() {
+        return mMaxZoom;
+    }
+}