Add expiration update and keys change events

In support of unprefixed EME

bug: 19771612
bug: 19771431
Change-Id: Ibb8471701a62dedfbf5231ad958e2c33ebb3c42f
diff --git a/include/media/hardware/CryptoAPI.h b/include/media/hardware/CryptoAPI.h
index c800825..ab8e2e2 100644
--- a/include/media/hardware/CryptoAPI.h
+++ b/include/media/hardware/CryptoAPI.h
@@ -68,7 +68,8 @@
     // the resolution of the video being decrypted.  The media player should
     // call this method when the resolution is determined and any time it
     // is subsequently changed.
-    virtual void notifyResolution(uint32_t width, uint32_t height) {}
+
+    virtual void notifyResolution(uint32_t /* width */, uint32_t /* height */) {}
 
     // If the error returned falls into the range
     // ERROR_DRM_VENDOR_MIN..ERROR_DRM_VENDOR_MAX, errorDetailMsg should be