Fixes for renew on license load

[ Merge of http://go/wvgerrit/173290 ]

* Renew timer offset from when license is loaded verifies that the
  rental duration has not expired and begins decryption.
* Renew timer offset from first decrypt bugfix
* Feature is enabled based on oemcrypto v18 presence
* Renewal logic verifies that |can_renew| is enabled
* Unit tests were added to reflect use cases from duration
  and renewal documentation

Bug: 278751387
Test: policy unittests, CdmUseCase tests, wvts tests
Change-Id: I3070b3f31b316e150c28ebe38d0440ab1eeb89b9

libwvdrmengine/cdm/core/include/policy_timers.h

@@ -119,7 +119,7 @@ class PolicyTimers {
   // started playing. This takes into account GetHardLicenseExpiryTime.
   virtual int64_t GetExpiryTime(int64_t current_time,
                                 bool ignore_soft_enforce_playback_duration);
-
+  virtual int64_t GetRentalExpiryTime(int64_t current_time);
   virtual int64_t GetRenewalStartTime() { return renewal_start_time_; }
 
   // This is the current policy information for this license. This gets updated
@@ -139,7 +139,6 @@ class PolicyTimers {
 
  private:
   // Gets the clock time that the rental duration or playback will expire.
-  virtual int64_t GetRentalExpiryTime(int64_t current_time);
   virtual int64_t GetPlaybackExpiryTime(
       int64_t current_time, bool ignore_soft_enforce_playback_duration);
   bool HasRentalOrPlaybackDurationExpired(int64_t current_time);

libwvdrmengine/cdm/core/include/policy_timers_v18.h

@@ -47,6 +47,7 @@ class PolicyTimersV18 : public PolicyTimers {
   // Indicates whether this is an initial license or a renewal
   bool license_renewal_ = false;
   bool renew_on_first_decrypt_ = false;
+  bool can_renew_ = false;
 
   CORE_DISALLOW_COPY_AND_ASSIGN(PolicyTimersV18);
 };