Add custom action support

components/arc/common/accessibility_helper.mojom

Index: components/arc/common/accessibility_helper.mojom
diff --git a/components/arc/common/accessibility_helper.mojom b/components/arc/common/accessibility_helper.mojom
index f3651b2356a5288163b4f727844bdd1ed15d7ecf..730bdda44107d83437dad8f6943eedf310f7ff7b 100644
--- a/components/arc/common/accessibility_helper.mojom
+++ b/components/arc/common/accessibility_helper.mojom
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Next MinVersion: 3
+// Next MinVersion: 4
 
 module arc.mojom;
 
@@ -69,7 +69,15 @@ enum AccessibilityActionType {
   EXPAND,
   COLLAPSE,
   DISMISS,
-  SET_TEXT
+  SET_TEXT,
+  CONTEXT_CLICK,
+  SCROLL_DOWN,
+  SCROLL_LEFT,
+  SCROLL_RIGHT,
+  SCROLL_TO_POSITION,
+  SCROLL_UP,
+  SET_PROGRESS,
+  SHOW_ON_SCREEN
 };
 
 // Possible boolean properties set on an AccessibilityNodeInfo.
@@ -130,7 +138,13 @@ enum AccessibilityIntProperty {
 [Extensible]
 enum AccessibilityIntListProperty {
   CHILD_NODE_IDS,
-  ACTIONS
+  ACTIONS,
+  CUSTOM_ACTION_IDS
+};
+
+[Extensible]
+enum AccessibilityStringListProperty {
+  CUSTOM_ACTION_DESCRIPTIONS
 };
 
 // AccessibilityNodeInfoData is a struct to contain info of
@@ -144,6 +158,7 @@ struct AccessibilityNodeInfoData {
   [MinVersion=1]map<AccessibilityIntProperty, int32>? int_properties;
   [MinVersion=1]
       map<AccessibilityIntListProperty, array<int32>>? int_list_properties;
+  [MinVersion=3]map<AccessibilityStringListProperty, array<string>>? string_list_properties;
 };
 
 // Filters the event type (and implicitly the data) sent by the ARC
@@ -182,7 +197,7 @@ interface AccessibilityHelperHost {
   OnAccessibilityEvent@1(AccessibilityEventData event_data);
 };
 
-// Next method ID: 3
+// Next method ID: 4
 interface AccessibilityHelperInstance {
   Init@0(AccessibilityHelperHost host);
 
@@ -191,4 +206,7 @@ interface AccessibilityHelperInstance {
 
   // Set a filter on the event types received.
   SetFilter@2(AccessibilityFilterType filter_type);
+
+  // Perform a custom action on a node requested by a Chrome client.
+  [MinVersion=3]PerformCustomAction@3(int32 id, int32 custom_action_id);
 };