cc: Add some impl-side painting stub classes and APIs

cc/picture_pile.cc

+// Copyright 2012 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 "config.h"
+
+#include "cc/picture_pile.h"
+
+namespace cc {
+
+PicturePile::PicturePile() {
+}
+
+PicturePile::~PicturePile() {
+}
+
+void PicturePile::invalidate(gfx::Rect rect) {
+  // TODO(enne)
+}
+
+void PicturePile::resize(gfx::Size size) {
+  // TODO(enne)
+}
+
+void PicturePile::update(ContentLayerClient* painter) {
+  // TODO(enne)
+}
+
+void PicturePile::pushPropertiesTo(PicturePile& other) {
+  other.size_ = size_;
+  other.pile_.resize(pile_.size());
+  for (size_t i = 0; i < pile_.size(); ++i)
+    other.pile_[i] = pile_[i];
+}
+
+}  // namespace cc