Revert of Make cc/paint have concrete types

cc/paint/paint_recorder.h

 // Copyright 2017 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_PAINT_PAINT_RECORDER_H_
 #define CC_PAINT_PAINT_RECORDER_H_
 
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "base/memory/ptr_util.h"
-#include "base/optional.h"
-#include "cc/paint/paint_canvas.h"
-#include "cc/paint/paint_record.h"
 #include "third_party/skia/include/core/SkPictureRecorder.h"
 
 namespace cc {
-
-class CC_PAINT_EXPORT PaintRecorder {
- public:
-  PaintRecorder();
-  ~PaintRecorder();
-
-  ALWAYS_INLINE PaintCanvas* beginRecording(const SkRect& bounds) {
-    uint32_t record_flags = 0;
-    canvas_.emplace(recorder_.beginRecording(bounds, nullptr, record_flags));
-    return getRecordingCanvas();
-  }
-
-  ALWAYS_INLINE PaintCanvas* beginRecording(
-      SkScalar width,
-      SkScalar height,
-      SkBBHFactory* rtree_factory = nullptr) {
-    uint32_t record_flags = 0;
-    canvas_.emplace(
-        recorder_.beginRecording(width, height, rtree_factory, record_flags));
-    return getRecordingCanvas();
-  }
-
-  // Only valid between between and finish recording.
-  ALWAYS_INLINE PaintCanvas* getRecordingCanvas() {
-    return canvas_.has_value() ? &canvas_.value() : nullptr;
-  }
-
-  ALWAYS_INLINE sk_sp<PaintRecord> finishRecordingAsPicture(
-      uint32_t end_flags = 0) {
-    sk_sp<SkPicture> picture = recorder_.finishRecordingAsPicture(end_flags);
-    // Some users (e.g. printing) use the existence of the recording canvas
-    // to know if recording is finished, so reset it here.
-    canvas_.reset();
-    return sk_ref_sp(static_cast<PaintRecord*>(picture.get()));
-  }
-
-  ALWAYS_INLINE sk_sp<PaintRecord> finishRecordingAsPictureWithCull(
-      const SkRect& cull_rect,
-      uint32_t end_flags = 0) {
-    sk_sp<SkPicture> picture =
-        recorder_.finishRecordingAsPictureWithCull(cull_rect, end_flags);
-    canvas_.reset();
-    return sk_ref_sp(static_cast<PaintRecord*>(picture.get()));
-  }
-
- private:
-  SkPictureRecorder recorder_;
-  base::Optional<PaintCanvas> canvas_;
-
-  DISALLOW_COPY_AND_ASSIGN(PaintRecorder);
-};
-
-}  // namespace cc
+using PaintRecorder = SkPictureRecorder;
+}
 
 #endif  // CC_PAINT_PAINT_RECORDER_H_