Add lint check against "Foo *bar" and "Foo &bar" declarations.

cpplint.py

Index: cpplint.py
===================================================================
--- cpplint.py	(revision 99952)
+++ cpplint.py	(working copy)
@@ -2898,7 +2898,7 @@
 
 def ProcessLine(filename, file_extension,
                 clean_lines, line, include_state, function_state,
-                class_state, error):
+                class_state, error, extra_check_functions=[]):
   """Processes a single line in the file.
 
   Args:
@@ -2926,9 +2926,11 @@
                                 class_state, error)
   CheckPosixThreading(filename, clean_lines, line, error)
   CheckInvalidIncrement(filename, clean_lines, line, error)
+  for check_fn in extra_check_functions:
+  	check_fn(filename, clean_lines, line, error)
 
-
-def ProcessFileData(filename, file_extension, lines, error):
+def ProcessFileData(filename, file_extension, lines, error,
+                    extra_check_functions=[]):
   """Performs lint checks and reports any errors to the given error function.
 
   Args:
@@ -2956,7 +2958,8 @@
   clean_lines = CleansedLines(lines)
   for line in xrange(clean_lines.NumLines()):
     ProcessLine(filename, file_extension, clean_lines, line,
-                include_state, function_state, class_state, error)
+                include_state, function_state, class_state, error,
+                extra_check_functions)
   class_state.CheckFinished(filename, error)
 
   CheckForIncludeWhatYouUse(filename, clean_lines, include_state, error)
@@ -2967,7 +2970,7 @@
 
   CheckForNewlineAtEOF(filename, lines, error)
 
-def ProcessFile(filename, vlevel):
+def ProcessFile(filename, vlevel, extra_check_functions=[]):
   """Does google-lint on a single file.
 
   Args:
@@ -3019,7 +3022,8 @@
       and file_extension != 'cpp'):
     sys.stderr.write('Ignoring %s; not a .cc or .h file\n' % filename)
   else:
-    ProcessFileData(filename, file_extension, lines, Error)
+    ProcessFileData(filename, file_extension, lines, Error,
+                    extra_check_functions)
     if carriage_return_found and os.linesep != '\r\n':
       # Use 0 for linenum since outputing only one error for potentially
       # several lines.