Implement cc::CompositorFrameMetadata StructTraits

cc/ipc/compositor_frame_metadata.mojom

Index: cc/ipc/compositor_frame_metadata.mojom
diff --git a/cc/ipc/compositor_frame_metadata.mojom b/cc/ipc/compositor_frame_metadata.mojom
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index 0000000000000000000000000000000000000000..8db3460dd018d915ac00f0e03cbf51f2f24952dc
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+++ b/cc/ipc/compositor_frame_metadata.mojom
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+// Copyright 2016 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 cc.mojom;
+
+import "cc/ipc/selection.mojom";
+import "cc/ipc/surface_id.mojom";
+import "ui/events/mojo/latency_info.mojom";
+import "ui/gfx/geometry/mojo/geometry.mojom";
+
+// See cc/output/compositor_frame_metadata.h.
+struct CompositorFrameMetadata {
+  float device_scale_factor;
+  gfx.mojom.Vector2dF root_scroll_offset;
+  float page_scale_factor;
+  gfx.mojom.SizeF scrollable_viewport_size;
+  gfx.mojom.SizeF root_layer_size;
+  float min_page_scale_factor;
+  float max_page_scale_factor;
+  bool root_overflow_x_hidden;
+  bool root_overflow_y_hidden;
+  gfx.mojom.Vector2dF location_bar_offset;
+  gfx.mojom.Vector2dF location_bar_content_translation;
+  uint32 root_background_color;
+  Selection selection;
+  array<ui.mojom.LatencyInfo> latency_info;
+  array<uint32> satisfies_sequences;
+  array<SurfaceId> referenced_surfaces;
+};