Take a snapshot of the AXTree

ui/android/java/src/org/chromium/ui/AXNodeData.java

Index: ui/android/java/src/org/chromium/ui/AXNodeData.java
diff --git a/ui/android/java/src/org/chromium/ui/AXNodeData.java b/ui/android/java/src/org/chromium/ui/AXNodeData.java
new file mode 100644
index 0000000000000000000000000000000000000000..9030df4224dddc2ffbee81ed4868fe9769ad8d13
--- /dev/null
+++ b/ui/android/java/src/org/chromium/ui/AXNodeData.java
@@ -0,0 +1,37 @@
+// Copyright 2015 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.ui;
+
+import java.util.ArrayList;
+
+/**
+ * A data struct to convey AXNodeData information to Java side.

[dmazzoni, 2015/04/10 19:20:00]

I think we should convey how this differs from similar data structures in
BrowserAccessibilityManager.java.

Something like: This is a lightweight data structure that encodes some key
information from the accessibility tree for operations that need a quick
one-time snapshot of the web content. This is different from
BrowserAccessibilityManager.java, which maintains a persistent Android
accessibility tree that can be queried synchronously by the Android framework.

[sgurun-gerrit only, 2015/04/10 23:24:50]

That is a very clear description. Thanks!

+ */
+public class AXNodeData {

[dmazzoni, 2015/04/10 19:20:00]

It feels like this is the wrong level of abstraction or the wrong name.
AXNodeData is a core accessibility data structure in Chromium code, but this
class is just encoding some narrow Android-specific information so it doesn't
seem right to give it exactly the same name. Historically we also don't use "AX"
in Android / Java code, but I don't care too much about that.

My thought is to call it something like AndroidAccessibilitySnapshotNode and put
it in, e.g.
content/public/android/java/src/org/chromium/content/browser/webcontents

I think "Android" should be in the class name explicitly to indicate that this
is an Android-specific object, not just the Android counterpart to a
cross-platform object (which AXNodeData implies).

[sgurun-gerrit only, 2015/04/10 23:24:50]

Done.

+
+    public int id;
+    public int x, y, scrollX, scrollY, width, height;
+    public int childCount;
+    public String text;
+    public String className;
+    public ArrayList<AXNodeData> children = new ArrayList<AXNodeData>();
+
+    public AXNodeData(int id, int x, int y, int scrollX, int scrollY, int width, int height,
+            String text, String className) {
+        this.id = id;
+        this.x = x;
+        this.y = y;
+        this.scrollX = scrollX;
+        this.scrollY = scrollY;
+        this.width = width;
+        this.height = height;
+        this.text = text;
+        this.className = className;
+    }
+
+    public void addChild(AXNodeData node) {
+        children.add(node);
+    }
+}