Use relative bounding boxes throughout Chrome accessibility

ui/accessibility/ax_relative_bounds.cc

Index: ui/accessibility/ax_relative_bounds.cc
diff --git a/ui/accessibility/ax_relative_bounds.cc b/ui/accessibility/ax_relative_bounds.cc
new file mode 100644
index 0000000000000000000000000000000000000000..322a0680fc3e3d64eca1c77725be61fdf56e508a
--- /dev/null
+++ b/ui/accessibility/ax_relative_bounds.cc
@@ -0,0 +1,69 @@
+// Copyright 2016 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.
+
+#include "ui/accessibility/ax_relative_bounds.h"
+
+#include "base/strings/string_number_conversions.h"
+#include "ui/gfx/transform.h"
+
+using base::IntToString;
+
+namespace ui {
+
+AXRelativeBounds::AXRelativeBounds()
+    : offset_container_id(-1) {
+}
+
+AXRelativeBounds::~AXRelativeBounds() {
+}
+
+AXRelativeBounds::AXRelativeBounds(const AXRelativeBounds& other) {
+  offset_container_id = other.offset_container_id;
+  bounds = other.bounds;
+  if (other.transform)
+    transform.reset(new gfx::Transform(*other.transform));
+}
+
+AXRelativeBounds& AXRelativeBounds::operator=(AXRelativeBounds other) {
+  offset_container_id = other.offset_container_id;
+  bounds = other.bounds;
+  if (other.transform)
+    transform.reset(new gfx::Transform(*other.transform));
+  return *this;
+}
+
+bool AXRelativeBounds::operator==(const AXRelativeBounds& other) {
+  if (offset_container_id != other.offset_container_id)
+    return false;
+  if (bounds != other.bounds)
+    return false;
+  if (!transform && !other.transform)
+    return true;
+  if ((transform && !other.transform) || (!transform && other.transform))
+    return false;
+  return *transform == *other.transform;
+}
+
+bool AXRelativeBounds::operator!=(const AXRelativeBounds& other) {
+  return !operator==(other);
+}
+
+std::string AXRelativeBounds::ToString() const {
+  std::string result;
+
+  if (offset_container_id != -1)
+    result += "offset_container_id=" + IntToString(offset_container_id) + " ";
+
+  result += "(" + IntToString(bounds.x()) + ", " +
+      IntToString(bounds.y()) + ")-(" +
+      IntToString(bounds.width()) + ", " +
+      IntToString(bounds.height()) + ")";
+
+  if (transform && !transform->IsIdentity())
+    result += " transform=" + transform->ToString();
+
+  return result;
+}
+
+}  // namespace ui