[aura-mus] Add ui::CursorData, with mojo serialization.

services/ui/public/interfaces/cursor/cursor_struct_traits.cc

+// 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.
+
+#include "services/ui/public/interfaces/cursor/cursor_struct_traits.h"
+
+#include "skia/public/interfaces/bitmap_array_struct_traits.h"
+#include "skia/public/interfaces/bitmap_skbitmap_struct_traits.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "ui/base/cursor/cursor.h"
+#include "ui/gfx/geometry/mojo/geometry_struct_traits.h"
+
+namespace mojo {
+
+// static
+const std::vector<SkBitmap>&
+StructTraits<ui::mojom::CursorDataDataView, ui::CursorData>::cursor_frames(
+    const ui::CursorData& c) {
+  return c.cursor_frames();
+}
+
+// static
+bool StructTraits<ui::mojom::CursorDataDataView, ui::CursorData>::Read(
+    ui::mojom::CursorDataDataView data,
+    ui::CursorData* out) {
+  ui::mojom::CursorType type = data.native_type();
+  if (type != ui::mojom::CursorType::CUSTOM) {
+    *out = ui::CursorData(static_cast<int>(type));
+    return true;
+  }
+
+  gfx::Point hotspot;
+  std::vector<SkBitmap> cursor_frames;
+  uint32_t frame_delay_ms = data.frame_delay_ms();
+
+  if (!data.ReadHotspot(&hotspot) || !data.ReadCursorFrames(&cursor_frames)) {

[sky, 2017/03/31 04:57:57]

no {}

[Elliot Glaysher, 2017/03/31 21:18:15]

(now legitimately multiline.)

+    return false;
+  }
+
+  *out = ui::CursorData(hotspot, cursor_frames, frame_delay_ms);
+  return true;
+}
+
+}  // namespace mojo