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..f4eaecc296df5a095b1b4b40ce4e6363c5391b0b
--- /dev/null
+++ b/ui/display/mojo/display_snapshot_mojo_struct_traits.h
@@ -0,0 +1,115 @@
+// 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/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_mojo) {
+    return display_snapshot_mojo->display_id();
+  }
+
+  static gfx::Point origin(const std::unique_ptr<display::DisplaySnapshotMojo>&

[kylechar, 2017/02/13 22:01:24]

Return const references if possible, which should be possible here. This will
create a temporary copy needlessly. 


This applies to all places where you're returning from an accessor and it
returns a class/struct by const reference. There are a couple of others.

[thanhph1, 2017/02/14 20:20:53]

Done.

+                               display_snapshot_mojo) {
+    return display_snapshot_mojo->origin();
+  }
+
+  static gfx::Size physical_size(
+      const std::unique_ptr<display::DisplaySnapshotMojo>&
+          display_snapshot_mojo) {
+    return display_snapshot_mojo->physical_size();
+  }
+
+  static display::DisplayConnectionType type(
+      const std::unique_ptr<display::DisplaySnapshotMojo>&
+          display_snapshot_mojo) {
+    return display_snapshot_mojo->type();
+  }
+
+  static bool is_aspect_preserving_scaling(
+      const std::unique_ptr<display::DisplaySnapshotMojo>&
+          display_snapshot_mojo) {
+    return display_snapshot_mojo->is_aspect_preserving_scaling();
+  }
+
+  static bool has_overscan(const std::unique_ptr<display::DisplaySnapshotMojo>&
+                               display_snapshot_mojo) {
+    return display_snapshot_mojo->has_overscan();
+  }
+
+  static bool has_color_correction_matrix(
+      const std::unique_ptr<display::DisplaySnapshotMojo>&
+          display_snapshot_mojo) {
+    return display_snapshot_mojo->has_color_correction_matrix();
+  }
+
+  static std::string display_name(
+      const std::unique_ptr<display::DisplaySnapshotMojo>&
+          display_snapshot_mojo) {
+    return display_snapshot_mojo->display_name();
+  }
+
+  static const base::FilePath sys_path(
+      const std::unique_ptr<display::DisplaySnapshotMojo>&
+          display_snapshot_mojo) {
+    return display_snapshot_mojo->sys_path();
+  }
+
+  static std::vector<uint8_t> edid(
+      const std::unique_ptr<display::DisplaySnapshotMojo>&
+          display_snapshot_mojo) {
+    return display_snapshot_mojo->edid();
+  }
+
+  static std::vector<std::unique_ptr<display::DisplayMode>> modes(
+      const std::unique_ptr<display::DisplaySnapshotMojo>&
+          display_snapshot_mojo);
+
+  static uint64_t current_mode_index(
+      const std::unique_ptr<display::DisplaySnapshotMojo>&
+          display_snapshot_mojo);
+
+  static bool current_mode_exist(

[kylechar, 2017/02/13 22:01:24]

has_current_mode

[thanhph1, 2017/02/14 20:20:53]

Done.

+      const std::unique_ptr<display::DisplaySnapshotMojo>&
+          display_snapshot_mojo) {
+    return display_snapshot_mojo->current_mode_exist();
+  }
+
+  static uint64_t native_mode_index(
+      const std::unique_ptr<display::DisplaySnapshotMojo>&
+          display_snapshot_mojo);
+
+  static bool native_mode_exist(

[kylechar, 2017/02/13 22:01:24]

has_native_mode

[thanhph1, 2017/02/14 20:20:53]

Done.

+      const std::unique_ptr<display::DisplaySnapshotMojo>&
+          display_snapshot_mojo) {
+    return display_snapshot_mojo->native_mode_exist();
+  }
+
+  static int64_t product_id(const std::unique_ptr<display::DisplaySnapshotMojo>&
+                                display_snapshot_mojo) {
+    return display_snapshot_mojo->product_id();
+  }
+
+  static gfx::Size maximum_cursor_size(
+      const std::unique_ptr<display::DisplaySnapshotMojo>&
+          display_snapshot_mojo) {
+    return display_snapshot_mojo->maximum_cursor_size();
+  }
+
+  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_