Support focus highlight in Android window

components/arc/common/accessibility_helper.mojom

+// 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.
+
+// Next MinVersion: 1
+
+module arc.mojom;
+
+import "screen_rect.mojom";
+
+// AccessibilityEventType is a enum which corresponds to event types of
+// AccessibilityEvent in Android.
+[Extensible]
+enum AccessibilityEventType {
+  VIEW_FOCUSED,
+};
+
+// AccessibilityNodeInfoData is a struct to contain info of
+// AccessibilityNodeInfo in Android.
+struct AccessibilityNodeInfoData {
+  ScreenRect boundsInScreen;
+};
+
+// Next method ID: 1
+interface AccessibilityHelperHost {
+  OnAccessibilityEvent@0(AccessibilityEventType eventType,

[hidehiko, 2017/01/20 13:24:15]

This is an interface between ARC and Chrome. So it is more important to
explicitly add documents.
Could you document when this is called (even if it looks clear, at the moment?).

[yawano, 2017/01/23 09:04:51]

Done.

+                         AccessibilityNodeInfoData eventSource);
+};
+
+// Next method ID: 1
+interface AccessibilityHelperInstance {
+  Init@0(AccessibilityHelperHost host);
+};