tools/gn: Add out-of-line copy ctors for complex classes.

tools/gn/pattern.cc

 // 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.
 
 #include "tools/gn/pattern.h"
 
 #include "tools/gn/value.h"
 
 namespace {
 
@@ skipping 42 matching lines @@
 }  // namespace
 
 Pattern::Pattern(const std::string& s) {
   ParsePattern(s, &subranges_);
   is_suffix_ =
       (subranges_.size() == 2 &&
        subranges_[0].type == Subrange::ANYTHING &&
        subranges_[1].type == Subrange::LITERAL);
 }
 
+Pattern::Pattern(const Pattern& other) = default;
+
 Pattern::~Pattern() {
 }
 
 bool Pattern::MatchesString(const std::string& s) const {
   // Empty pattern matches only empty string.
   if (subranges_.empty())
     return s.empty();
 
   if (is_suffix_) {
     const std::string& suffix = subranges_[1].literal;
@@ skipping 71 matching lines @@
     default:
       NOTREACHED();
   }
 
   return false;
 }
 
 PatternList::PatternList() {
 }
 
+PatternList::PatternList(const PatternList& other) = default;
+
 PatternList::~PatternList() {
 }
 
 void PatternList::Append(const Pattern& pattern) {
   patterns_.push_back(pattern);
 }
 
 void PatternList::SetFromValue(const Value& v, Err* err) {
   patterns_.clear();
 
@@ skipping 16 matching lines @@
       return true;
   }
   return false;
 }
 
 bool PatternList::MatchesValue(const Value& v) const {
   if (v.type() == Value::STRING)
     return MatchesString(v.string_value());
   return false;
 }