Write mojom and StructTraits for DisplaySnapshot.

ui/display/mojo/display_snapshot_mojo_struct_traits.h

Index: ui/display/mojo/display_snapshot_mojo_struct_traits.h
diff --git a/ui/display/mojo/display_snapshot_mojo_struct_traits.h b/ui/display/mojo/display_snapshot_mojo_struct_traits.h
new file mode 100644
index 0000000000000000000000000000000000000000..ae66b68e62dd5fa0b6560365ae4c75a0c9aa4625
--- /dev/null
+++ b/ui/display/mojo/display_snapshot_mojo_struct_traits.h
@@ -0,0 +1,91 @@
+// 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 UI_DISPLAY_MOJO_DISPLAY_SNAPSHOT_MOJO_STRUCT_TRAITS_H_
+#define UI_DISPLAY_MOJO_DISPLAY_SNAPSHOT_MOJO_STRUCT_TRAITS_H_
+
+#include "ui/display/mojo/display_snapshot_mojo.h"
+#include "ui/display/mojo/display_snapshot_mojo.mojom.h"
+#include "ui/display/types/display_mode.h"
+
+namespace mojo {
+
+template <>
+struct StructTraits<display::mojom::DisplaySnapshotMojoDataView,
+                    std::unique_ptr<display::DisplaySnapshotMojo>> {
+  static int64_t display_id(
+      const std::unique_ptr<display::DisplaySnapshotMojo>& display_snapshot) {
+    return display_snapshot->display_id();
+  }
+
+  static gfx::Point origin(
+      const std::unique_ptr<display::DisplaySnapshotMojo>& display_snapshot) {
+    return display_snapshot->origin();
+  }
+
+  static gfx::Size physical_size(
+      const std::unique_ptr<display::DisplaySnapshotMojo>& display_snapshot) {
+    return display_snapshot->physical_size();
+  }
+
+  static display::DisplayConnectionType type(
+      const std::unique_ptr<display::DisplaySnapshotMojo>& display_snapshot) {
+    return display_snapshot->type();
+  }
+
+  static bool is_aspect_preserving_scaling(
+      const std::unique_ptr<display::DisplaySnapshotMojo>& display_snapshot) {
+    return display_snapshot->is_aspect_preserving_scaling();
+  }
+
+  static bool has_overscan(
+      const std::unique_ptr<display::DisplaySnapshotMojo>& display_snapshot) {
+    return display_snapshot->has_overscan();
+  }
+
+  static bool has_color_correction_matrix(
+      const std::unique_ptr<display::DisplaySnapshotMojo>& display_snapshot) {
+    return display_snapshot->has_color_correction_matrix();
+  }
+
+  static std::string display_name(
+      const std::unique_ptr<display::DisplaySnapshotMojo>& display_snapshot) {
+    return display_snapshot->display_name();
+  }
+
+  static const base::FilePath sys_path(
+      const std::unique_ptr<display::DisplaySnapshotMojo>& display_snapshot) {
+    return display_snapshot->sys_path();
+  }
+
+  static bool compare_display_mode(

[kylechar, 2017/02/10 21:40:30]

I meant move the the whole function to the .cc file, not just the
implementation. This shouldn't be part of the StructTraits public API, although
adding operator== might be a better choice if this is used multiple places.

[thanhph1, 2017/02/13 20:09:12]

This makes sense. I use operator==. Thanks!

+      const display::DisplayMode& display_mode_lhs,
+      const display::DisplayMode& display_mode_rhs);
+
+  static std::vector<uint8_t> edid(
+      const std::unique_ptr<display::DisplaySnapshotMojo>& display_snapshot) {
+    return display_snapshot->edid();
+  }
+
+  static std::vector<std::unique_ptr<display::DisplayMode>> modes(
+      const std::unique_ptr<display::DisplaySnapshotMojo>& display_snapshot);
+
+  static int64_t current_mode_index(
+      const std::unique_ptr<display::DisplaySnapshotMojo>& display_snapshot);
+
+  static int64_t native_mode_index(
+      const std::unique_ptr<display::DisplaySnapshotMojo>& display_snapshot);
+
+  static int64_t product_id(
+      const std::unique_ptr<display::DisplaySnapshotMojo>& display_snapshot) {
+    return display_snapshot->product_id();
+  }
+
+  static bool Read(display::mojom::DisplaySnapshotMojoDataView data,
+                   std::unique_ptr<display::DisplaySnapshotMojo>* out);
+};
+
+}  // namespace mojo
+
+#endif  // UI_DISPLAY_MOJO_DISPLAY_SNAPSHOT_MOJO_STRUCT_TRAITS_H_