CC Animation: Expose TargetProperty enum to be aliased in Blink Platform.

cc/animation/animation_target_property.cc

+// Copyright (c) 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/animation/animation_target_property.h"
+
+#include "base/macros.h"
+
+namespace cc {
+
+namespace {
+
+// This should match the TargetProperty enum.
+static const char* const s_targetPropertyNames[] = {
+    "TRANSFORM", "OPACITY", "FILTER", "SCROLL_OFFSET", "BACKGROUND_COLOR"};
+
+static_assert(static_cast<int>(AnimationTargetProperty::LAST_TARGET_PROPERTY) +
+                      1 ==
+                  arraysize(s_targetPropertyNames),
+              "TargetPropertyEnumSize should equal the number of elements in "
+              "s_targetPropertyNames");
+
+}  // namespace
+
+const char* GetAnimationTargetPropertyName(AnimationTargetProperty property) {
+  return s_targetPropertyNames[static_cast<int>(property)];
+}
+
+std::ostream& operator<<(std::ostream& out, AnimationTargetProperty property) {
+  out << GetAnimationTargetPropertyName(property);
+  return out;
+}
+
+}  // namespace cc