Add a integration test suite for BlobChannel.

blimp/common/blob_cache/test_util.cc

Index: blimp/common/blob_cache/test_util.cc
diff --git a/blimp/common/blob_cache/mock_blob_cache.cc b/blimp/common/blob_cache/test_util.cc
similarity index 60%
copy from blimp/common/blob_cache/mock_blob_cache.cc
copy to blimp/common/blob_cache/test_util.cc
index 4cf10522588b680929bcbe0a751f6e8dbff32b4f..e416b815e61bc1b928a7da9cf6bd030108784233 100644
--- a/blimp/common/blob_cache/mock_blob_cache.cc
+++ b/blimp/common/blob_cache/test_util.cc
@@ -2,12 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "blimp/common/blob_cache/mock_blob_cache.h"
+#include "blimp/common/blob_cache/test_util.h"
 
 namespace blimp {
 
-MockBlobCache::MockBlobCache() {}
-
-MockBlobCache::~MockBlobCache() {}
+BlobDataPtr CreateBlobDataPtr(const std::string& data) {
+  return new BlobData(data);
+}
 
 }  // namespace blimp