diff -r 000000000000 -r 6474c204b198 mobile/android/base/gfx/PanZoomTarget.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mobile/android/base/gfx/PanZoomTarget.java	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,33 @@
+/* -*- 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.gfx;
+
+import org.mozilla.gecko.ZoomConstraints;
+
+import android.graphics.PointF;
+import android.graphics.RectF;
+
+public interface PanZoomTarget {
+    public ImmutableViewportMetrics getViewportMetrics();
+    public ZoomConstraints getZoomConstraints();
+    public boolean isFullScreen();
+    public RectF getMaxMargins();
+
+    public void setAnimationTarget(ImmutableViewportMetrics viewport);
+    public void setViewportMetrics(ImmutableViewportMetrics viewport);
+    public void scrollBy(float dx, float dy);
+    public void scrollMarginsBy(float dx, float dy);
+    public void panZoomStopped();
+    /** This triggers an (asynchronous) viewport update/redraw. */
+    public void forceRedraw(DisplayPortMetrics displayPort);
+
+    public boolean post(Runnable action);
+    public boolean postDelayed(Runnable action, long delayMillis);
+    public void postRenderTask(RenderTask task);
+    public void removeRenderTask(RenderTask task);
+    public Object getLock();
+    public PointF convertViewPointToLayerPoint(PointF viewPoint);
+}