Revert of Back PaintRecord with PaintOpBuffer instead of SkPicture

cc/paint/paint_recorder.cc

 // 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.
 
 #include "cc/paint/paint_recorder.h"
 
-#include "cc/paint/paint_op_buffer.h"
-
 namespace cc {
 
 PaintRecorder::PaintRecorder() = default;
-
 PaintRecorder::~PaintRecorder() = default;
 
-PaintCanvas* PaintRecorder::beginRecording(const SkRect& bounds) {
-  buffer_.reset(new PaintOpBuffer(bounds));
-  canvas_.emplace(buffer_.get());
-  return getRecordingCanvas();
-}
-
-sk_sp<PaintRecord> PaintRecorder::finishRecordingAsPicture() {
-  // SkPictureRecorder users expect that their saves are automatically
-  // closed for them.
-  //
-  // NOTE: Blink paint in general doesn't appear to need this, but the
-  // RecordingImageBufferSurface::fallBackToRasterCanvas finishing off the
-  // current frame depends on this.  Maybe we could remove this assumption and
-  // just have callers do it.
-  canvas_->restoreToCount(1);
-
-  // Some users (e.g. printing) use the existence of the recording canvas
-  // to know if recording is finished, so reset it here.
-  canvas_.reset();
-
-  buffer_->ShrinkToFit();
-  return std::move(buffer_);
-}
-
 }  // namespace cc