Add allocator interface for use by cdm_adapter

media/cdm/cdm_buffer_allocator_impl.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 "media/cdm/cdm_buffer_allocator_impl.h"
+
+#include "base/logging.h"
+#include "media/cdm/cdm_buffer_impl.h"
+
+namespace media {
+
+CdmBufferAllocatorImpl::CdmBufferAllocatorImpl() {}
+
+CdmBufferAllocatorImpl::~CdmBufferAllocatorImpl() {}
+
+CdmBuffer* CdmBufferAllocatorImpl::Allocate(uint32_t capacity) {
+  if (!capacity)
+    return nullptr;
+
+  return CdmBufferImpl::Create(capacity);
+}
+
+void CdmBufferAllocatorImpl::Release(uint32_t buffer_id) {
+  NOTREACHED();
+}
+
+}  // namespace media