Implement CompositorFrame Struct Traits

cc/ipc/compositor_frame_struct_traits.h

+// 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.
+
+#ifndef CC_IPC_COMPOSITOR_FRAME_STRUCT_TRAITS_H_
+#define CC_IPC_COMPOSITOR_FRAME_STRUCT_TRAITS_H_
+
+#include "cc/ipc/compositor_frame.mojom.h"
+#include "cc/output/compositor_frame.h"
+
+namespace mojo {
+
+template <>
+struct StructTraits<cc::mojom::CompositorFrame, cc::CompositorFrame> {
+  static const cc::CompositorFrameMetadata& metadata(
+      const cc::CompositorFrame& input) {
+    return input.metadata;
+  }
+
+  static const cc::TransferableResourceArray& resources(
+      const cc::CompositorFrame& input) {
+    return input.delegated_frame_data->resource_list;
+  }
+
+  static const cc::RenderPassList& passes(const cc::CompositorFrame& input) {
+    return input.delegated_frame_data->render_pass_list;
+  }
+
+  static bool Read(cc::mojom::CompositorFrameDataView data,
+                   cc::CompositorFrame* out) {
+    if (!data.ReadMetadata(&out->metadata))

[dcheng, 2016/06/27 02:05:00]

Let's move this to a .cc, since it's non-trivial.

[Fady Samuel, 2016/06/27 03:05:10]

Done. I ended up also pulling out non-trivial Read methods for
CompositorFrameMetadata and TransferableResource to cc files to make the include
list in the cc sane.

+      return false;
+
+    out->delegated_frame_data.reset(new cc::DelegatedFrameData());
+    return data.ReadResources(&out->delegated_frame_data->resource_list) &&
+           data.ReadPasses(&out->delegated_frame_data->render_pass_list);
+  }
+};
+
+}  // namespace mojo
+
+#endif  // CC_IPC_COMPOSITOR_FRAME_STRUCT_TRAITS_H_