[EasyUnlock] Move DataWithTimestamp out of ForegroundEidGenerator so it can be shared.

components/cryptauth/foreground_eid_generator.h

Index: components/cryptauth/foreground_eid_generator.h
diff --git a/components/cryptauth/foreground_eid_generator.h b/components/cryptauth/foreground_eid_generator.h
index 8068078c5e05f9df29c4a3d19645ac0dc30ae9e6..ec68de89920d69d39c70f50dd68b9986cca55d33 100644
--- a/components/cryptauth/foreground_eid_generator.h
+++ b/components/cryptauth/foreground_eid_generator.h
@@ -12,6 +12,7 @@
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/time/clock.h"
+#include "components/cryptauth/data_with_timestamp.h"
 
 namespace cryptauth {
 
@@ -40,22 +41,6 @@ struct RemoteDevice;
 // See go/proximity-auth-ble-advertising.
 class ForegroundEidGenerator {
  public:
-  // Stores EID-related data and timestamps at which time this data becomes
-  // active or inactive.
-  struct DataWithTimestamp {
-    DataWithTimestamp(const std::string& data,
-                      const int64_t start_timestamp_ms,
-                      const int64_t end_timestamp_ms);
-    DataWithTimestamp(const DataWithTimestamp& other);
-
-    bool ContainsTime(const int64_t timestamp_ms) const;
-    std::string DataInHex() const;
-
-    const std::string data;
-    const int64_t start_timestamp_ms;
-    const int64_t end_timestamp_ms;
-  };
-
   // Data for both a current and adjacent EID. The current EID *must* be
   // supplied, but adjacent data may be null. Each EID consists of a 2-byte EID
   // value paired with the timestamp at which time this value becomes active or