Add Promises for EME (Chromium side)

ppapi/c/private/pp_content_decryptor.h

Index: ppapi/c/private/pp_content_decryptor.h
diff --git a/ppapi/c/private/pp_content_decryptor.h b/ppapi/c/private/pp_content_decryptor.h
index bdee6ed4217eb2272f46d3903896e636af399858..c49bcf02d0a3d8ef402d7ebd3b8cf0d73085afee 100644
--- a/ppapi/c/private/pp_content_decryptor.h
+++ b/ppapi/c/private/pp_content_decryptor.h
@@ -3,7 +3,7 @@
  * found in the LICENSE file.
  */
 
-/* From private/pp_content_decryptor.idl modified Wed Apr  9 10:36:52 2014. */
+/* From private/pp_content_decryptor.idl modified Thu May  1 10:35:03 2014. */
 
 #ifndef PPAPI_C_PRIVATE_PP_CONTENT_DECRYPTOR_H_
 #define PPAPI_C_PRIVATE_PP_CONTENT_DECRYPTOR_H_
@@ -449,6 +449,15 @@ typedef enum {
   PP_DECRYPTORSTREAMTYPE_VIDEO = 1
 } PP_DecryptorStreamType;
 PP_COMPILE_ASSERT_SIZE_IN_BYTES(PP_DecryptorStreamType, 4);
+
+/**
+ * <code>PP_SessionType</code> contains session type constants.
+ */
+typedef enum {
+  PP_SESSIONTYPE_TEMPORARY = 0,
+  PP_SESSIONTYPE_PERSISTENT = 1
+} PP_SessionType;
+PP_COMPILE_ASSERT_SIZE_IN_BYTES(PP_SessionType, 4);
 /**
  * @}
  */