Fix range checking for PP_CdmKeyStatus

ppapi/api/private/pp_content_decryptor.idl

Index: ppapi/api/private/pp_content_decryptor.idl
diff --git a/ppapi/api/private/pp_content_decryptor.idl b/ppapi/api/private/pp_content_decryptor.idl
index da62b14c272288a0aaf303bf614b10ce22b1f73c..9ac7e2f64864998e22796e7d871b552485b9bbad 100644
--- a/ppapi/api/private/pp_content_decryptor.idl
+++ b/ppapi/api/private/pp_content_decryptor.idl
@@ -402,7 +402,8 @@ struct PP_VideoDecoderConfig {
 [assert_size(4)]
 enum PP_DecryptorStreamType {
   PP_DECRYPTORSTREAMTYPE_AUDIO = 0,
-  PP_DECRYPTORSTREAMTYPE_VIDEO = 1
+  PP_DECRYPTORSTREAMTYPE_VIDEO = 1,
+  PP_DECRYPTORSTREAMTYPE_MAX = PP_DECRYPTORSTREAMTYPE_VIDEO
 };
 
 /**
@@ -412,7 +413,8 @@ enum PP_DecryptorStreamType {
 enum PP_SessionType {
   PP_SESSIONTYPE_TEMPORARY = 0,
   PP_SESSIONTYPE_PERSISTENT_LICENSE = 1,
-  PP_SESSIONTYPE_PERSISTENT_RELEASE = 2
+  PP_SESSIONTYPE_PERSISTENT_RELEASE = 2,
+  PP_SESSIONTYPE_MAX = PP_SESSIONTYPE_PERSISTENT_RELEASE
 };
 
 /**
@@ -422,7 +424,8 @@ enum PP_SessionType {
 enum PP_InitDataType {
   PP_INITDATATYPE_CENC = 0,
   PP_INITDATATYPE_KEYIDS = 1,
-  PP_INITDATATYPE_WEBM = 2
+  PP_INITDATATYPE_WEBM = 2,
+  PP_INITDATATYPE_MAX = PP_INITDATATYPE_WEBM
 };
 
 /**
@@ -436,7 +439,8 @@ enum PP_CdmExceptionCode {
   PP_CDMEXCEPTIONCODE_QUOTAEXCEEDEDERROR = 4,
   PP_CDMEXCEPTIONCODE_UNKNOWNERROR = 5,
   PP_CDMEXCEPTIONCODE_CLIENTERROR = 6,
-  PP_CDMEXCEPTIONCODE_OUTPUTERROR = 7
+  PP_CDMEXCEPTIONCODE_OUTPUTERROR = 7,
+  PP_CDMEXCEPTIONCODE_MAX = PP_CDMEXCEPTIONCODE_OUTPUTERROR
 };
 
 /**
@@ -446,7 +450,8 @@ enum PP_CdmExceptionCode {
 enum PP_CdmMessageType {
   PP_CDMMESSAGETYPE_LICENSE_REQUEST = 0,
   PP_CDMMESSAGETYPE_LICENSE_RENEWAL = 1,
-  PP_CDMMESSAGETYPE_LICENSE_RELEASE = 2
+  PP_CDMMESSAGETYPE_LICENSE_RELEASE = 2,
+  PP_CDMMESSAGETYPE_MAX = PP_CDMMESSAGETYPE_LICENSE_RELEASE
 };
 
 /**
@@ -460,7 +465,8 @@ enum PP_CdmKeyStatus {
   PP_CDMKEYSTATUS_OUTPUTRESTRICTED = 3,
   PP_CDMKEYSTATUS_OUTPUTDOWNSCALED = 4,
   PP_CDMKEYSTATUS_STATUSPENDING = 5,
-  PP_CDMKEYSTATUS_RELEASED = 6
+  PP_CDMKEYSTATUS_RELEASED = 6,
+  PP_CDMKEYSTATUS_MAX = PP_CDMKEYSTATUS_RELEASED
 };
 
 /**