Split ClipTransformRecorder into {Clip,Transform}Recorder.

ui/compositor/transform_recorder.cc

+// Copyright 2015 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 "ui/compositor/transform_recorder.h"
+
+#include "cc/playback/display_item_list.h"
+#include "cc/playback/transform_display_item.h"
+#include "ui/compositor/paint_context.h"
+
+namespace ui {
+
+TransformRecorder::TransformRecorder(const PaintContext& context)
+  : context_(context), transformed_(false) {
+}
+
+TransformRecorder::~TransformRecorder() {
+  if (transformed_)
+    context_.list_->CreateAndAppendItem<cc::EndTransformDisplayItem>();
+}
+
+void TransformRecorder::Transform(const gfx::Transform& transform) {
+  DCHECK(!transformed_);
+  auto* item = context_.list_->CreateAndAppendItem<cc::TransformDisplayItem>();
+  item->SetNew(transform);
+  transformed_ = true;
+}
+
+}  // namespace ui