Extract nested and private classes from VideoCaptureBufferPool

content/browser/renderer_host/media/shared_memory_buffer_handle.cc

+// Copyright 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 "content/browser/renderer_host/media/shared_memory_buffer_handle.h"
+
+#include "content/browser/renderer_host/media/shared_memory_buffer_tracker.h"
+
+namespace content {
+
+SharedMemoryBufferHandle::SharedMemoryBufferHandle(
+    SharedMemoryBufferTracker* tracker)
+    : tracker_(tracker) {}
+
+SharedMemoryBufferHandle::~SharedMemoryBufferHandle() = default;
+
+gfx::Size SharedMemoryBufferHandle::dimensions() const {
+  return tracker_->dimensions();
+}
+
+size_t SharedMemoryBufferHandle::mapped_size() const {
+  return tracker_->mapped_size_;
+}
+
+void* SharedMemoryBufferHandle::data(int plane) {
+  DCHECK_EQ(plane, 0);
+  return tracker_->shared_memory_.memory();
+}
+
+ClientBuffer SharedMemoryBufferHandle::AsClientBuffer(int plane) {
+  NOTREACHED();
+  return nullptr;
+}
+
+#if defined(OS_POSIX) && !defined(OS_MACOSX)
+base::FileDescriptor SharedMemoryBufferHandle::AsPlatformFile() {
+  return tracker_->shared_memory_.handle();
+}
+#endif
+
+}  // namespace content