Handle Mozilla license blocks in the GN header checker.

tools/gn/c_include_iterator_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "tools/gn/c_include_iterator.h"
 #include "tools/gn/input_file.h"
 #include "tools/gn/location.h"
 
 namespace {
@@ skipping 114 matching lines @@
   base::StringPiece contents;
   LocationRange range;
 
   CIncludeIterator iter(&file);
   for (size_t group = 0; group < kGroupCount; group++) {
     EXPECT_TRUE(iter.GetNextIncludeString(&contents, &range));
     EXPECT_EQ(include, contents.as_string());
   }
   EXPECT_FALSE(iter.GetNextIncludeString(&contents, &range));
 }
+
+// Tests that comments of the form
+//    /*
+//     *
+//     */
+// are not counted toward the non-include line count.
+TEST(CIncludeIterator, CStyleComments) {
+  std::string buffer("/*");
+  for (size_t i = 0; i < 1000; i++)
+    buffer.append(" *\n");
+  buffer.append(" */\n\n");
+  buffer.append("#include \"foo/bar.h\"\n");
+
+  InputFile file(SourceFile("//foo.cc"));
+  file.SetContents(buffer);
+
+  base::StringPiece contents;
+  LocationRange range;
+
+  CIncludeIterator iter(&file);
+  EXPECT_TRUE(iter.GetNextIncludeString(&contents, &range));
+  EXPECT_EQ("foo/bar.h", contents);
+}