Revert of Use an explicit list of webkit-patch commands instead of using auto-discovery.

third_party/WebKit/Tools/Scripts/webkitpy/tool/multi_command_tool.py

Index: third_party/WebKit/Tools/Scripts/webkitpy/tool/multi_command_tool.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/tool/multi_command_tool.py b/third_party/WebKit/Tools/Scripts/webkitpy/tool/multi_command_tool.py
index f4f85b1006a56bdc98b6370a4f2b3829ffdb0021..ad10d1a73f6d98b63afdbbd48bbd907037ad245d 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/tool/multi_command_tool.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/tool/multi_command_tool.py
@@ -35,6 +35,7 @@
 import logging
 import sys
 
+from webkitpy.tool.commands.command import Command
 from webkitpy.tool.commands.command import HelpPrintingOptionParser
 from webkitpy.tool.commands.help_command import HelpCommand
 
@@ -47,14 +48,28 @@
 
     def __init__(self, name=None, commands=None):
         self._name = name or optparse.OptionParser(prog=name).get_prog_name()  # OptionParser has nice logic for fetching the name.
-        self.commands = commands or []
+        # Allow the unit tests to disable command auto-discovery.
+        self.commands = commands or [cls() for cls in self._find_all_commands() if cls.name]
         self.help_command = self.command_by_name(HelpCommand.name)
-        # Require the help command, even if the manual test list doesn't include one.
+        # Require a help command, even if the manual test list doesn't include one.
         if not self.help_command:
             self.help_command = HelpCommand()
             self.commands.append(self.help_command)
         for command in self.commands:
             command.bind_to_tool(self)
+
+    @classmethod
+    def _add_all_subclasses(cls, class_to_crawl, seen_classes):
+        for subclass in class_to_crawl.__subclasses__():
+            if subclass not in seen_classes:
+                seen_classes.add(subclass)
+                cls._add_all_subclasses(subclass, seen_classes)
+
+    @classmethod
+    def _find_all_commands(cls):
+        commands = set()
+        cls._add_all_subclasses(Command, commands)
+        return sorted(commands)
 
     def name(self):
         return self._name