Add allocator interface for use by cdm_adapter

media/cdm/aes_decryptor_unittest.cc

Index: media/cdm/aes_decryptor_unittest.cc
diff --git a/media/cdm/aes_decryptor_unittest.cc b/media/cdm/aes_decryptor_unittest.cc
index 82338be6a6ab7e59575a5ef88db6e1f2006319d0..f46e093a4d93daa6b94f8590704bd2913388d203 100644
--- a/media/cdm/aes_decryptor_unittest.cc
+++ b/media/cdm/aes_decryptor_unittest.cc
@@ -23,6 +23,7 @@
 #include "media/cdm/api/content_decryption_module.h"
 #include "media/cdm/cdm_adapter.h"
 #include "media/cdm/external_clear_key_test_helper.h"
+#include "media/cdm/simple_cdm_buffer_allocator.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest-param-test.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -244,10 +245,11 @@ class AesDecryptorTest : public testing::TestWithParam<std::string> {
       CdmConfig cdm_config;  // default settings of false are sufficient.
 
       helper_.reset(new ExternalClearKeyTestHelper());
+      scoped_ptr<CdmBufferAllocator> allocator(new SimpleCdmBufferAllocator());
       CdmAdapter::Create(
           helper_->KeySystemName(), helper_->LibraryPath(), cdm_config,
-          base::Bind(&AesDecryptorTest::OnSessionMessage,
-                     base::Unretained(this)),
+          std::move(allocator), base::Bind(&AesDecryptorTest::OnSessionMessage,
+                                           base::Unretained(this)),
           base::Bind(&AesDecryptorTest::OnSessionClosed,
                      base::Unretained(this)),
           base::Bind(&AesDecryptorTest::OnLegacySessionError,