Implement `gn analyze`.

tools/gn/label.h

 // Copyright (c) 2013 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.
 
 #ifndef TOOLS_GN_LABEL_H_
 #define TOOLS_GN_LABEL_H_
 
 #include <stddef.h>
 
 #include "base/containers/hash_tables.h"
@@ skipping 14 matching lines @@
   Label(const SourceDir& dir,
         const base::StringPiece& name,
         const SourceDir& toolchain_dir,
         const base::StringPiece& toolchain_name);
 
   // Makes a label with an empty toolchain.
   Label(const SourceDir& dir, const base::StringPiece& name);
   Label(const Label& other);
   ~Label();
 
-  // Resolives a string from a build file that may be relative to the
+  // Resolves a string from a build file that may be relative to the
   // current directory into a fully qualified label. On failure returns an
   // is_null() label and sets the error.
   static Label Resolve(const SourceDir& current_dir,
                        const Label& current_toolchain,
                        const Value& input,
                        Err* err);
 
   bool is_null() const { return dir_.is_null(); }
 
   const SourceDir& dir() const { return dir_; }
@@ skipping 71 matching lines @@
   }
 };
 
 }  // namespace BASE_HASH_NAMESPACE
 
 inline void swap(Label& lhs, Label& rhs) {
   lhs.swap(rhs);
 }
 
 #endif  // TOOLS_GN_LABEL_H_