Add CryptoPluginMode to WV extractor

Allows the WV extractor to run in a mode that is compatible with
the DRM CryptoPlugin HAL API, where decryption is deferred
until the encrypted data is sent through the CryptoPlugin to
the codec.

This patch does:
 (1) Adds a flag mCryptoPluginMode that controls this behavior
     [Note: need framework support to enable/disable this]
 (2) Accumulates information in track metadata to delineate
     crypto unit boundaries for the CryptoPlugin

related-to-bug: 5986621

Change-Id: I3318d5cde38c7b02a7bdb56aca9aece852c9781c

proprietary/streamcontrol/include/WVStreamControlAPI.h

@@ -70,6 +70,7 @@ typedef void (*WVSocketInfoCallback)(int fd, int status, void * context);
 //     [in] dts -     Decode timestamp, 90 KHz clock
 //     [in] pts -     Presentation timestamp, 90 KHz clock
 //     [in] au_end -  Indicates end of Access Unit (last CU in frame)
+//     [in] context - Client context established from WV_Setup
 //
 // Returns:
 //     - WV_Status_OK:               Decryption succeeded
@@ -78,7 +79,8 @@ typedef void (*WVSocketInfoCallback)(int fd, int status, void * context);
 //     - Error code indicating problem.  Causes playback to halt.
 //
 typedef WVStatus (*WVDecryptCallback)(WVEsSelector es_type, void* input, void* output, size_t length,
-                                      int key, unsigned long long dts, unsigned long long pts, bool au_end);
+                                      int key, unsigned long long dts, unsigned long long pts,
+                                      bool au_end, void *context);
 
 enum WVDecryptCallbackMode {
     WVDecryptCallbackMode_MultiCU =  0,      // WVDecryptCallback called repeatedly until buffer exhausted