Implement CompositorFrame Struct Traits

cc/ipc/compositor_frame_metadata_struct_traits.cc

+// 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.
+
+#include "cc/ipc/compositor_frame_metadata_struct_traits.h"
+#include "cc/ipc/selection_struct_traits.h"
+#include "cc/ipc/surface_id_struct_traits.h"
+#include "ui/events/mojo/latency_info_struct_traits.h"
+#include "ui/gfx/mojo/selection_bound_struct_traits.h"
+
+namespace mojo {
+
+// static
+bool StructTraits<cc::mojom::CompositorFrameMetadata,
+                  cc::CompositorFrameMetadata>::
+    Read(cc::mojom::CompositorFrameMetadataDataView data,
+         cc::CompositorFrameMetadata* out) {
+  out->device_scale_factor = data.device_scale_factor();
+  if (!data.ReadRootScrollOffset(&out->root_scroll_offset))
+    return false;
+
+  out->page_scale_factor = data.page_scale_factor();
+  if (!data.ReadScrollableViewportSize(&out->scrollable_viewport_size) ||
+      !data.ReadRootLayerSize(&out->root_layer_size)) {
+    return false;
+  }
+
+  out->min_page_scale_factor = data.min_page_scale_factor();
+  out->max_page_scale_factor = data.max_page_scale_factor();
+  out->root_overflow_x_hidden = data.root_overflow_x_hidden();
+  out->root_overflow_y_hidden = data.root_overflow_y_hidden();
+  if (!data.ReadLocationBarOffset(&out->location_bar_offset) ||
+      !data.ReadLocationBarContentTranslation(
+          &out->location_bar_content_translation)) {
+    return false;
+  }
+
+  out->root_background_color = data.root_background_color();
+  return data.ReadSelection(&out->selection) &&
+         data.ReadLatencyInfo(&out->latency_info) &&
+         data.ReadSatisfiesSequences(&out->satisfies_sequences) &&
+         data.ReadReferencedSurfaces(&out->referenced_surfaces);
+}
+
+}  // namespace mojo