Write mojom and StructTraits for DisplaySnapshot.

ui/display/mojo/display_snapshot.mojom

Index: ui/display/mojo/display_snapshot.mojom
diff --git a/ui/display/mojo/display_snapshot.mojom b/ui/display/mojo/display_snapshot.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..e7d25833884730923601201e6027ba13647d09c8
--- /dev/null
+++ b/ui/display/mojo/display_snapshot.mojom
@@ -0,0 +1,31 @@
+// 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.
+
+module display.mojom;
+
+import "ui/gfx/geometry/mojo/geometry.mojom";
+import "ui/display/mojo/display_constants.mojom";
+import "ui/display/mojo/display_mode.mojom";
+
+// Corresponds to display::DisplaySnapshot
+struct DisplaySnapshot {
+  int64 display_id;
+  gfx.mojom.Point origin;
+  gfx.mojom.Size physical_size;
+  DisplayConnectionType type;
+  bool is_aspect_preserving_scaling;
+  bool has_overscan;
+  bool has_color_correction_matrix;
+  string display_name;
+  string sys_path;
+  array<display.mojom.DisplayMode> modes;
+  array<uint8> edid;
+  bool has_current_mode;
+  display.mojom.DisplayMode current_mode;

[kylechar, 2017/02/09 15:05:53]

bool + DisplayMode takes more memory than an int32. Please fix.

[thanhph1, 2017/02/10 19:54:32]

I removed this file.

+  bool has_native_mode;
+  display.mojom.DisplayMode native_mode;
+  int64 product_id;
+  string string_representation;

[kylechar, 2017/02/09 15:05:53]

This isn't part of display::DispalySnapshot and isn't necessary.

[thanhph1, 2017/02/10 19:54:32]

Done, I removed maximum_cursor_size also.

+  gfx.mojom.Size maximum_cursor_size;
+};