Implement cc::SharedQuadState StructTraits

cc/ipc/shared_quad_state.mojom

Index: cc/ipc/shared_quad_state.mojom
diff --git a/cc/ipc/shared_quad_state.mojom b/cc/ipc/shared_quad_state.mojom
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+++ b/cc/ipc/shared_quad_state.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 "ui/gfx/geometry/mojo/geometry.mojom";
+import "ui/gfx/mojo/transform.mojom";
+
+struct SharedQuadState {
+  // gfx.mojom.Transforms quad rects into the target content space.
+  gfx.mojom.Transform quad_to_target_transform;
+
+  // The size of the quads' originating layer in the space of the quad rects.
+  gfx.mojom.Size quad_layer_bounds;
+
+  // The size of the visible area in the quads' originating layer, in the space
+  // of the quad rects.
+  gfx.mojom.Rect visible_quad_layer_rect;
+
+  // This rect lives in the target content space.
+  gfx.mojom.Rect clip_rect;
+
+  bool is_clipped;
+  float opacity;
+  // TODO(fsamuel): Change this to an SkXfermode enum once native enums are
+  // supported.
+  uint32 blend_mode;
+  int32 sorting_context_id;
+};
+