handler: Implement read/write/close/delete

Implement read/write/close/delete as pass-through functions.

Signed-off-by: Kun Yi <kunyi@google.com>
Change-Id: I56b935b03b8048a70a168d00061c043795b90f5e
diff --git a/binarystore_mock.hpp b/binarystore_mock.hpp
index ada526d..7792e74 100644
--- a/binarystore_mock.hpp
+++ b/binarystore_mock.hpp
@@ -14,6 +14,7 @@
     MOCK_CONST_METHOD1(canHandleBlob, bool(const std::string&));
     MOCK_CONST_METHOD0(getBlobIds, std::vector<std::string>());
     MOCK_METHOD2(openOrCreateBlob, bool(const std::string&, uint16_t));
+    MOCK_METHOD1(deleteBlob, bool(const std::string&));
     MOCK_METHOD2(read, std::vector<uint8_t>(uint32_t, uint32_t));
     MOCK_METHOD2(write, bool(uint32_t, const std::vector<uint8_t>&));
     MOCK_METHOD0(commit, bool());