Enable usage reporting

[ Merge from Widevine CDM repo of
  https://widevine-internal-review.googlesource.com/#/c/10171/ and
  https://widevine-internal-review.googlesource.com/#/c/10172/ ]

Updated license_protocol.proto from constituent protos in google3

These changes make use of OEMCrypto v9 changes to support usage reporting.
Usage reporting may be enabled for streaming (by means of secure stops) and
offline playback by a provider session token specified in the license.

Changes include periodically updating usage information for relevant
sessions and reporting and releasing usage information as needed.

The CDM has removed all references to Secure Stops. This change
updates the Android API implementation to comply.

b/11987015

Change-Id: Ibb6f2ced4ef20ee349ca1ae6412ce686b2b5d085

libwvdrmengine/cdm/core/include/cdm_engine.h

@@ -88,10 +88,9 @@ class CdmEngine {
       std::string* cert,
       std::string* wrapped_key);
 
-  // Secure stop related methods
-  CdmResponseType GetSecureStops(CdmSecureStops* secure_stops);
-  CdmResponseType ReleaseSecureStops(
-      const CdmSecureStopReleaseMessage& message);
+  // Usage related methods for streaming licenses
+  CdmResponseType GetUsageInfo(CdmUsageInfo* usage_info);
+  CdmResponseType ReleaseUsageInfo(const CdmUsageInfoReleaseMessage& message);
 
   // Decryption and key related methods
   // Accept encrypted buffer and return decrypted data.
@@ -126,6 +125,9 @@ class CdmEngine {
   CdmReleaseKeySetMap release_key_sets_;
   CertificateProvisioning cert_provisioning_;
   SecurityLevel cert_provisioning_requested_security_level_;
+  CdmSession* usage_session_;
+
+  int64_t last_usage_information_update_time;
 
   CORE_DISALLOW_COPY_AND_ASSIGN(CdmEngine);
 };