Write mojom and StructTraits for DisplaySnapshot.

ui/display/display_snapshot_mojo.h

Index: ui/display/display_snapshot_mojo.h
diff --git a/ui/display/display_snapshot_mojo.h b/ui/display/display_snapshot_mojo.h
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+++ b/ui/display/display_snapshot_mojo.h
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+// 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_DISPLAY_SNAPSHOT_MOJO_H_
+#define UI_DISPLAY_DISPLAY_SNAPSHOT_MOJO_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "ui/display/display_export.h"
+#include "ui/display/types/display_snapshot.h"
+
+namespace display {
+
+// DisplaySnapshot implementation that can be used with Mojo IPC.
+class DISPLAY_EXPORT DisplaySnapshotMojo : public DisplaySnapshot {
+ public:
+  DisplaySnapshotMojo(int64_t display_id,
+                      const gfx::Point& origin,
+                      const gfx::Size& physical_size,
+                      DisplayConnectionType type,
+                      bool is_aspect_preserving_scaling,
+                      bool has_overscan,
+                      bool has_color_correction_matrix,
+                      std::string display_name,
+                      const base::FilePath& sys_path,
+                      int64_t product_id,
+                      DisplayModeList modes,
+                      const std::vector<uint8_t>& edid,
+                      const DisplayMode* current_mode,
+                      const DisplayMode* native_mode,
+                      const gfx::Size& maximum_cursor_size);
+  ~DisplaySnapshotMojo() override;
+  std::unique_ptr<DisplaySnapshotMojo> Clone() const;
+
+  // DisplaySnapshot:
+  std::string ToString() const override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DisplaySnapshotMojo);
+};
+
+}  // namespace display
+
+#endif  // UI_DISPLAY_DISPLAY_SNAPSHOT_MOJO_H_