Extract creation and expiration times from DRM cert

[ Merge of http://go/wvgerrit/119843 ]

Creation and expiration times are extracted from the device DRM
certificate. They are reported as
 * -1 if not set in the proto
 * 0 if unlimited
 * positive number otherwise

Bug: 169740403
Test: WV unit, integraiton tests
Change-Id: I9463954dfeb82b6a88ff5d608ed74d20f2424e83

libwvdrmengine/cdm/core/include/certificate_provisioning.h

@@ -54,9 +54,13 @@ class CertificateProvisioning {
 
   // Extract serial number and system ID from a DRM Device certificate.
   // Either |serial_number| or |system_id| may be null, but not both.
+  // Both |creation_time_seconds| and |expiration_time_seconds| may be null.
+  // |creation_time_seconds| and |expiration_time_seconds| will be set to -1
+  // if not present, 0 if unlimited and a valid time otherwise
   static bool ExtractDeviceInfo(const std::string& device_certificate,
-                                std::string* serial_number,
-                                uint32_t* system_id);
+                                std::string* serial_number, uint32_t* system_id,
+                                int64_t* creation_time_seconds,
+                                int64_t* expiration_time_seconds);
 
   // Removes json wrapping if applicable to extract the
   // SignedProvisioningMessage

libwvdrmengine/cdm/core/include/wv_cdm_constants.h

@@ -26,6 +26,7 @@ static const size_t CERTIFICATE_DATA_SIZE = 4 * 1024;
 // (NaN in JS translates to 0 in unix timestamp).
 static const int64_t NEVER_EXPIRES = 0;
 static const int64_t UNLIMITED_DURATION = 0;
+static const int64_t INVALID_TIME = -1;
 
 // This is the lower limit. For OEMCrypto v16+ one can query and find how many
 // are supported