AndroidOverlay implementation using Dialog.

content/public/android/java/src/org/chromium/content/browser/androidoverlay/DialogOverlayOperations.java

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.content.browser.androidoverlay;
+
+import android.os.Handler;
+import android.os.IBinder;
+import android.view.Surface;
+
+/**
+ * Common operations needed by DialogOverlayImpl, which are handy to mock out.
+ */
+interface DialogOverlayOperations {

[boliu, 2017/04/22 00:22:43]

is this interface necessary? I don't see any tests actually mocking this out

similarly, is the WindowTokenListener interface necessary?

Basically I don't quite understand the split between Ops and DialogSurfaceImpl.

[liberato (no reviews please), 2017/04/24 22:19:42]

i had planned to add a DialogOverlayImpl junit test, but ended up going with an
integration test since it seemed more useful.

i'll merge all of it back into DialogOverlayImpl .

+    interface WindowTokenListener {
+        void onWindowToken(final IBinder token);
+        public void onDismissed();
+    }
+
+    /**
+     * Notify that the overlay has been released by the client.
+     * This will be called on the Browser UI thread.
+     */
+    void notifyReleased();
+
+    /**
+     * Return a Handler that can post tasks to the overlay thread.
+     */
+    Handler getOverlayHandler();
+
+    /**
+     * Start receiving window token updates on |listener|.  This may only be called once.
+     * @param token routing token that we'll use to find the window token.
+     * @param listener listener that we'll send updates to.
+     */
+    void registerWindowTokenListener(
+            org.chromium.mojo.common.mojom.UnguessableToken token, WindowTokenListener listener);
+
+    /**
+     * Unregister the current listener, if any.  It is okay to call this without having called
+     * registerWindowTokenListener, and / or calling this more than once.
+     */
+    void unregisterWindowTokenListenerIfNeeded();
+
+    /**
+     * Register a surface and return the surface id for it.
+     * @param surface Surface that we should register.
+     * @return surface id that we associated with |surface|.
+     */
+    int registerSurface(Surface surface);
+    void unregisterSurface(int surfaceId);
+}