AndroidOverlay implementation using Dialog.

content/public/android/java/src/org/chromium/content/browser/androidoverlay/DialogOverlayOperationsImpl.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.app.Dialog;
+import android.content.Context;
+import android.os.Handler;
+import android.os.IBinder;
+import android.view.Surface;
+import android.view.Window;
+
+import org.chromium.base.annotations.CalledByNative;
+import org.chromium.base.annotations.JNINamespace;
+
+/**
+ * Basic impl of DialogOverlayOperations

[boliu, 2017/03/30 22:42:02]

nit: java doc require a period at the end

[liberato (no reviews please), 2017/04/04 17:49:28]

Done.

+ */
+@JNINamespace("content")
+class DialogOverlayOperationsImpl implements DialogOverlayOperations {
+    private long mNativeHandle;
+    private Handler mOverlayUiHandler;
+
+    // Runnable that we'll run when the overlay notifies us that it's been released.
+    private Runnable mReleasedRunnable;
+
+    // Listener to which we'll forward window token information.
+    private WindowTokenListener mListener;
+
+    public DialogOverlayOperationsImpl(Handler overlayUiHandler, Runnable releasedRunnable) {
+        mOverlayUiHandler = overlayUiHandler;
+        mReleasedRunnable = releasedRunnable;
+    }
+
+    @Override
+    public void notifyReleased() {
+        mReleasedRunnable.run();
+    }
+
+    // Remember: this will be called on the overlay-ui thread!
+    @Override
+    public Dialog createDialog(Context context) {

[boliu, 2017/03/30 22:42:02]

static, but I guess no longer overridable..

was this supposed to have a test implementation or something?

[liberato (no reviews please), 2017/04/04 17:49:28]

yeah, initially it was for DialogOverlayCoreTest.  we now send in the dialog in
DialogOverlayCore::initialize, i think.

i will move this out of Ops, into DialogOverlayImpl.

+        // Create the dialog, but don't lay it out or show it yet.  We'll do that when we get a new
+        // window token.
+        Dialog dialog = new Dialog(context, android.R.style.Theme_NoDisplay);
+        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
+        dialog.setCancelable(false);
+
+        return dialog;
+    }
+
+    @Override
+    public Handler getOverlayUiHandler() {
+        return mOverlayUiHandler;
+    }
+
+    @Override
+    public void registerWindowTokenListener(
+            org.chromium.mojo.common.mojom.UnguessableToken token, WindowTokenListener listener) {
+        mListener = listener;
+        mNativeHandle = nativeRegisterForTokens(token.high, token.low);

[boliu, 2017/03/30 22:42:02]

assert mNativeHandle == 0?

[liberato (no reviews please), 2017/04/04 17:49:28]

Done.

+    }
+
+    @Override
+    public void unregisterWindowTokenListener() {
+        nativeUnregisterForTokens(mNativeHandle);
+        mNativeHandle = 0;

[boliu, 2017/03/30 22:42:02]

probably should check or assert for non-0 before use, which.. is only in this
method

[liberato (no reviews please), 2017/04/04 17:49:28]

switched to do-nothing if |!mNativeHandle|.  simplifies DialogOverlayImpl, which
kept a boolean to remember if it needed to do so.

+    }
+
+    @Override
+    public int registerSurface(Surface surface) {
+        return nativeRegisterSurface(surface);
+    }
+
+    @Override
+    public void unregisterSurface(int surfaceId) {
+        nativeUnregisterSurface(surfaceId);
+    }
+
+    // Called on the browser UI (not overlay-ui) thread.
+    @CalledByNative
+    public void onWindowToken(final IBinder token) {

[boliu, 2017/03/30 22:42:02]

@CalledByNative should be private

[liberato (no reviews please), 2017/04/04 17:49:28]

Done, and elsewhere.

+        mListener.onWindowToken(token);
+    }
+
+    // Called on the browser UI thread.
+    // We're not getting any more window tokens.
+    @CalledByNative
+    public void onDismissed() {
+        mListener.onDismissed();
+    }
+
+    // Initializes native side.  Will register for onWindowToken callbacks.
+    native long nativeRegisterForTokens(long high, long low);

[boliu, 2017/03/30 22:42:02]

all native methods private, and looks like should all be static as well

[liberato (no reviews please), 2017/04/04 17:49:28]

Done, except for nativeRegisterForTokens which requires |this| to send
callbacks.

it reminds me that declaring something "native static" doesn't work, but "static
native" does.  i keep forgetting to look through the jni generator to make it
either fail outright or work.  right now, it just ignores the methods.

+
+    // Stops native side.
+    native void nativeUnregisterForTokens(long handle);
+
+    native int nativeRegisterSurface(Surface surface);
+    native void nativeUnregisterSurface(int surfaceId);
+}