Add allocator interface for use by cdm_adapter

media/cdm/cdm_allocator.cc

Index: media/cdm/cdm_allocator.cc
diff --git a/cc/proto/vector2d.proto b/media/cdm/cdm_allocator.cc
similarity index 54%
copy from cc/proto/vector2d.proto
copy to media/cdm/cdm_allocator.cc
index 15171844ffc443d28cae7c70e2149ac3989200ab..52e722c35f1ed39e26452b6fca184eec0d83967f 100644
--- a/cc/proto/vector2d.proto
+++ b/media/cdm/cdm_allocator.cc
@@ -2,13 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-syntax = "proto2";
+#include "media/cdm/cdm_allocator.h"
 
-option optimize_for = LITE_RUNTIME;
+namespace media {
 
-package cc.proto;
+CdmAllocator::CdmAllocator() {}
 
-message Vector2d {
-  optional int64 x = 1;
-  optional int64 y = 2;
-}
+CdmAllocator::~CdmAllocator() {}
+
+}  // namespace media