Add ChromeCodingConvention.java to Closure Compiler to preserve getInstance() type

third_party/closure_compiler/checker.py

Index: third_party/closure_compiler/checker.py
diff --git a/third_party/closure_compiler/checker.py b/third_party/closure_compiler/checker.py
index 5ae34951f399d68082667aed5c3d1f10d69ebbab..ad465d43cad217b2da095f32bf283ad9c1eb7159 100644
--- a/third_party/closure_compiler/checker.py
+++ b/third_party/closure_compiler/checker.py
@@ -19,7 +19,7 @@ class LineNumber(object):
 
 class FileCache(object):
   _cache = defaultdict(str)
-    
+
   def _read(self, file):
     file = os.path.abspath(file)
     self._cache[file] = self._cache[file] or open(file, "r").read()
@@ -105,12 +105,13 @@ class Checker(object):
     "-XX:+TieredCompilation"
   ]
 
-  def __init__(self, verbose=False):
+  def __init__(self, verbose=False, return_output=False):
     current_dir = os.path.join(os.path.dirname(__file__))
     self._compiler_jar = os.path.join(current_dir, "lib", "compiler.jar")
     self._runner_jar = os.path.join(current_dir, "runner", "runner.jar")
     self._temp_files = []
     self._verbose = verbose
+    self._return_output = return_output
 
   def _clean_up(self):
     if not self._temp_files:
@@ -212,11 +213,16 @@ class Checker(object):
     self._debug("Summary: " + errors.pop())
 
     output = self._format_errors(map(self._fix_up_error, errors))
-    if runner_cmd.returncode:
-      self._fatal("Error in: " + file + ("\n" + output if output else ""))
-    elif output:
-      self._debug("Output: " + output)
-   
-    self._clean_up()
+    if self._return_output:
+      self._clean_up()
+
+      return output
+    else:
+      if runner_cmd.returncode:
+        self._fatal("Error in: " + file + ("\n" + output if output else ""))
+      elif output:
+        self._debug("Output: " + output)
+
+      self._clean_up()
 
-    return runner_cmd.returncode == 0
+      return runner_cmd.returncode == 0