Introducing SurfaceReferenceFactory

cc/surfaces/surface_info.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_SURFACES_SURFACE_INFO_H_
+#define CC_SURFACES_SURFACE_INFO_H_
+
+#include "cc/surfaces/surface_id.h"
+#include "ui/gfx/geometry/size.h"
+
+namespace cc {
+
+// This class contains information about the surface that is being embedded.
+class SurfaceInfo {
+ public:
+  SurfaceInfo() = default;
+  SurfaceInfo(const SurfaceId& id, float scale, const gfx::Size& size)
+      : id_(id), scale_(scale), size_(size) {}
+
+  bool operator==(const SurfaceInfo& info) const {
+    return id_ == info.id() && scale_ == info.scale() && size_ == info.size();
+  }
+
+  bool operator!=(const SurfaceInfo& info) const { return !(*this == info); }
+
+  const SurfaceId& id() const { return id_; }
+  float scale() const { return scale_; }
+  const gfx::Size& size() const { return size_; }
+
+ private:
+  SurfaceId id_;
+  float scale_ = 1.f;

[kylechar, 2016/12/15 19:08:45]

Should this be device_scale_factor_? There are other scale factors that it could
be confused with, which might be confusing. Also update scale() ->
device_scale_factor() if you update this.

+  gfx::Size size_;
+};
+
+}  // namespace cc
+
+#endif  // CC_SURFACES_SURFACE_INFO_H_