Mojo framework for AndroidOverlay.

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

Index: content/public/android/java/src/org/chromium/content/browser/androidoverlay/AndroidOverlayImpl.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/androidoverlay/AndroidOverlayImpl.java b/content/public/android/java/src/org/chromium/content/browser/androidoverlay/AndroidOverlayImpl.java
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index 0000000000000000000000000000000000000000..7861b50bbe9e7e64d3fc7a80ef9b121b457c6d35
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+++ b/content/public/android/java/src/org/chromium/content/browser/androidoverlay/AndroidOverlayImpl.java
@@ -0,0 +1,35 @@
+// 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 org.chromium.gfx.mojom.Rect;
+import org.chromium.media.mojom.AndroidOverlay;
+import org.chromium.media.mojom.AndroidOverlayClient;
+import org.chromium.media.mojom.AndroidOverlayConfig;
+import org.chromium.mojo.system.MojoException;
+
+/**
+ * Default AndroidOverlay impl.  Will use a separate (shared) overlay-ui thread to own a Dialog

[boliu, 2017/02/22 18:03:49]

why not just use the UI thread since it's simpler. Are there going to be
blocking/slow operations here?

[liberato (no reviews please), 2017/02/22 19:10:50]

SurfaceDestroyed is synchronous on this thread.  it's caused us many problems
when it's on the ui thread.  latency is one.  another is that it risks deadlock
with the gpu main thread while the sync callback is going on.

[boliu, 2017/02/22 19:15:59]

CompositorView::SurfaceDestroyed doesn't block.. But if you say media stuff is
less robust to this, then ok

+ * instance, probably via a separate object that operates only on that thread.  We will post
+ * messages to / from that thread from the main thread.
+ */
+public class AndroidOverlayImpl implements AndroidOverlay {
+    private static final String TAG = "AndroidOverlay";
+
+    public AndroidOverlayImpl(AndroidOverlayClient client, AndroidOverlayConfig config) {}
+
+    @Override
+    public void close() {
+        // Client has closed the connection.
+        // TODO(liberato): Allow any sync surfaceDestroyed to proceed.
+        // TODO(liberato): Notify our provider that we've been destroyed.
+    }
+
+    @Override
+    public void onConnectionError(MojoException e) {}
+
+    @Override
+    public void scheduleLayout(Rect rect) {}
+}