Merge MaxNumberOfSessions changes from CDM

Bug: 18377675

Implement new OEMCrypto function to get max number of sessions
https://widevine-internal-review.googlesource.com/#/c/12980/

Add oemcrypto static adapter for v9
https://widevine-internal-review.googlesource.com/#/c/13022/

Support new property to query MaxNumberOfSessions in CDM
https://widevine-internal-review.googlesource.com/#/c/13020/

Fix GetHdcpCapabilities incorrect return if not initialized
https://widevine-internal-review.googlesource.com/#/c/13210/

Change-Id: I02738c543cedd6e38d8826f845fec6cb2b1ede3c

libwvdrmengine/oemcrypto/include/OEMCryptoCENC.h

@@ -274,6 +274,7 @@ typedef enum RSA_Padding_Scheme {
 #define OEMCrypto_DeleteUsageTable         _oecc34
 #define OEMCrypto_LoadKeys                 _oecc35
 #define OEMCrypto_GenerateRSASignature     _oecc36
+#define OEMCrypto_GetMaxNumberOfSessions   _oecc37
 
 /*
  * OEMCrypto_Initialize
@@ -1993,6 +1994,30 @@ OEMCryptoResult OEMCrypto_DeleteUsageEntry(OEMCrypto_SESSION session,
  */
 OEMCryptoResult OEMCrypto_DeleteUsageTable();
 
+/*
+ * OEMCRYPTO_GetMaxNumberOfSessions()
+ *
+ * Description:
+ *   Returns the maximum number of concurrent OEMCrypto sessions supported by
+ *   the device. The CDM and OEMCrypto consumers can query this value so they
+ *   can use resources more effectively.
+ *
+ * Parameters:
+ *   maximum (out) - the maximum number of OEMCrypto sessions supported by the
+ *   device.
+ *
+ * Threading:
+ *   This function may be called simultaneously with any other functions.
+ *
+ * Returns:
+ *   OEMCrypto_SUCCESS
+ *   OEMCrypto_ERROR_UNKNOWN_FAILURE
+ *
+ * Version:
+ *   This method is added in API version 10.
+ */
+OEMCryptoResult OEMCrypto_GetMaxNumberOfSessions(size_t *max);
+
 #ifdef __cplusplus
 }
 #endif