Have HTMLMediaElement::play() return a Promise.

third_party/WebKit/Source/core/dom/DOMException.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 19 matching lines @@
 
 #include "core/dom/ExceptionCode.h"
 
 namespace blink {
 
 static const struct CoreException {
     const char* const name;
     const char* const message;
     const int code;
 } coreExceptions[] = {
+    // This list must be kept in sync with the one in ExceptionCode.h
     { "IndexSizeError", "Index or size was negative, or greater than the allowed value.", 1 },
     { "HierarchyRequestError", "A Node was inserted somewhere it doesn't belong.", 3 },
     { "WrongDocumentError", "A Node was used in a different document than the one that created it (that doesn't support it).", 4 },
     { "InvalidCharacterError", "The string contains invalid characters.", 5 },
     { "NoModificationAllowedError", "An attempt was made to modify an object where modifications are not allowed.", 7 },
     { "NotFoundError", "An attempt was made to reference a Node in a context where it does not exist.", 8 },
     { "NotSupportedError", "The implementation did not support the requested type of object or operation.", 9 },
     { "InUseAttributeError", "An attempt was made to add an attribute that is already in use elsewhere.", 10 },
     { "InvalidStateError", "An attempt was made to use an object that is not, or is no longer, usable.", 11 },
     { "SyntaxError", "An invalid or illegal string was specified.", 12 },
@@ skipping 24 matching lines @@
     { "PathExistsError", "An attempt was made to create a file or directory where an element already exists.", 0 },
 
     // SQL
     { "DatabaseError", "The operation failed for some reason related to the database.", 0 },
 
     // Web Crypto
     { "OperationError", "The operation failed for an operation-specific reason", 0 },
 
     // Push API
     { "PermissionDeniedError", "User or security policy denied the request.", 0 },
+
+    // Used by HTML and Media Session API.
+    { "NotAllowedError", "The request is not allowed by the user agent or the platform in the current context.", 0 },
+
+    // Please add new entries at the end of this list to guarantee any ordering
+    // expectations.
 };
 
 static const CoreException* getErrorEntry(ExceptionCode ec)
 {
     size_t tableSize = WTF_ARRAY_LENGTH(coreExceptions);
     size_t tableIndex = ec - IndexSizeError;
 
     return tableIndex < tableSize ? &coreExceptions[tableIndex] : 0;
 }
 
@@ skipping 54 matching lines @@
 {
     const CoreException* entry = getErrorEntry(ec);
     ASSERT(entry);
     if (!entry)
         return "Unknown error.";
 
     return entry->message;
 }
 
 } // namespace blink