Send voice interaction structure from cros to Arc.

content/public/browser/voice_interaction_helper.h

+// 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.
+
+#ifndef CONTENT_PUBLIC_BROWSER_VOICE_INTERACTION_HELPER_H_
+#define CONTENT_PUBLIC_BROWSER_VOICE_INTERACTION_HELPER_H_
+
+#include <stdint.h>
+
+#include <memory>
+#include <vector>
+
+#include "base/callback.h"
+#include "base/strings/string16.h"
+#include "ui/gfx/geometry/rect.h"
+
+namespace content {
+
+class WebContents;
+
+// An intermediate representation of the Accessibility snapshot
+// for voice interaction. The field names are kept consistent
+// with AccessibilitySnapshotNode.java.
+struct AXViewStructure {
+  AXViewStructure();
+  ~AXViewStructure();
+
+  gfx::Rect rect;
+  base::string16 text;
+  float text_size;
+  int32_t color;
+  int32_t bgcolor;
+  bool bold;
+  bool italic;
+  bool underline;
+  bool line_through;
+
+  bool has_selection;
+  int32_t start_selection;
+  int32_t end_selection;
+
+  std::string class_name;
+  std::vector<std::unique_ptr<AXViewStructure>> children;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(AXViewStructure);
+};
+
+void GetAXViewStructure(

[Avi (use Gerrit), 2017/04/04 20:11:01]

I don't understand this file.

It's named "voice interaction helper" but seems to have very generic
accessibility content. My objection here is

1. The content doesn't match the file.
2. Can't we use existing accessibility code?
3. Content is for web platform code, so unless this is useful for the general
web platform, this doesn't belong in content.

[Muyuan, 2017/04/04 20:43:49]

The idea is to share the code between Android Chrome and ARC. Essentially the
end goal is to move parts of web_contents_android.cc here. 

The naming conventions follow closely to Android Chrome:
https://cs.chromium.org/chromium/src/content/public/android/java/src/org/chro...

The accessibility code cannot be used directly due to dependency restrictions.

I'm not sure if this place is a good one. Another option would be to move the
files into content/public/browser/android.

+    WebContents* web_contents,
+    const base::Callback<void(std::unique_ptr<AXViewStructure>)>& callback);
+
+}  // namespace android
+
+#endif  // CONTENT_PUBLIC_BROWSER_ANDROID_VOICE_INTERACTION_HELPER_H_