Entitlement rotation support

Updates also include:
- Add APIs to query current Simulcrypt channel & stream status;
- EMM format change (used only to carry fingerprinting and service
blocking info);
- Key fetcher example to use curl key fetcher.

common/BUILD

@@ -105,6 +105,7 @@ cc_library(
         ":status",
         "//base",
         "//external:protobuf",
+        "@abseil_repo//absl/strings",
         "@abseil_repo//absl/synchronization",
         "//protos/public:client_identification_cc_proto",
         "//protos/public:device_certificate_status_cc_proto",
@@ -134,6 +135,7 @@ cc_test(
         "//external:protobuf",
         "//testing:gunit_main",
         "@abseil_repo//absl/memory",
+        "@abseil_repo//absl/strings",
         "//protos/public:device_common_cc_proto",
         "//protos/public:device_security_profile_data_cc_proto",
         "//protos/public:device_security_profile_list_cc_proto",
@@ -305,6 +307,7 @@ cc_library(
         "@abseil_repo//absl/memory",
         "@abseil_repo//absl/strings",
         "@abseil_repo//absl/synchronization",
+        "@abseil_repo//absl/time",
         "//protos/public:drm_certificate_cc_proto",
         "//protos/public:errors_cc_proto",
         "//protos/public:signed_drm_certificate_cc_proto",
@@ -1046,6 +1049,25 @@ cc_library(
     ],
 )
 
+cc_library(
+    name = "policy_verifier",
+    srcs = ["policy_verifier.cc"],
+    hdrs = ["policy_verifier.h"],
+    deps = [
+        "//protos/public:license_protocol_cc_proto",
+    ],
+)
+
+cc_test(
+    name = "policy_verifier_test",
+    srcs = ["policy_verifier_test.cc"],
+    deps = [
+        ":policy_verifier",
+        "//testing:gunit_main",
+        "//protos/public:license_protocol_cc_proto",
+    ],
+)
+
 cc_test(
     name = "output_protection_util_test",
     srcs = ["output_protection_util_test.cc"],
@@ -1150,6 +1172,7 @@ cc_library(
         ":sha_util",
         "//base",
         "@abseil_repo//absl/strings",
+        "//common/oemcrypto_core_message/odk",
         "//common/oemcrypto_core_message/odk:kdo",
     ],
 )
@@ -1161,6 +1184,9 @@ cc_test(
         ":core_message_util",
         "//testing:gunit_main",
         "@abseil_repo//absl/strings",
+        "//common/oemcrypto_core_message/odk",
+        "//protos/public:certificate_provisioning_cc_proto",
+        "//protos/public:license_protocol_cc_proto",
     ],
 )