Photo Picker dialog: Convert to AIDL for easier security review.

chrome/android/java/src/org/chromium/chrome/browser/photo_picker/IDecoderServiceCallback.aidl

+// 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.chrome.browser.photo_picker;
+
+/**
+ * This interface is used to communicate the results of an image decoding
+ * request.
+ */
+interface IDecoderServiceCallback {
+ /**
+  * Called when decoding is done.
+  * @param payload The results of the image decoding request, including the
+  *                decoded bitmap.
+  */
+  oneway void onDecodeImageDone(in Bundle payload);
+}