Report change in session expiration

Bug: 19771612

Merged from Widevine CDM repo:
https://widevine-internal-review.googlesource.com/#/c/13885/

Change-Id: I754f06a7ed9476554f9e1da3fe23f4563f9fc07e

libwvdrmengine/mediadrm/include/WVDrmPlugin.h

@@ -143,6 +143,9 @@ class WVDrmPlugin : public android::DrmPlugin,
 
   virtual void OnSessionExpiration(const CdmSessionId& cdmSessionId);
 
+  virtual void OnExpirationUpdate(const CdmSessionId& cdmSessionId,
+                                  int64_t new_expiry_time);
+
  private:
   DISALLOW_EVIL_CONSTRUCTORS(WVDrmPlugin);