gn: Support build directories outside the source tree.

tools/gn/label_pattern_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/err.h"
 #include "tools/gn/label_pattern.h"
 #include "tools/gn/value.h"
 
 namespace {
 
 struct PatternCase {
   const char* input;
   bool success;
 
   LabelPattern::Type type;
   const char* dir;
   const char* name;
   const char* toolchain;
 };
 
 }  // namespace
 
 TEST(LabelPattern, PatternParse) {
+  base::FilePath source_root("/source/root");
   SourceDir current_dir("//foo/");
   PatternCase cases[] = {
     // Missing stuff.
     { "", false, LabelPattern::MATCH, "", "", "" },
     { ":", false, LabelPattern::MATCH, "", "", "" },
     // Normal things.
     { ":bar", true, LabelPattern::MATCH, "//foo/", "bar", "" },
     { "//la:bar", true, LabelPattern::MATCH, "//la/", "bar", "" },
     { "*", true, LabelPattern::RECURSIVE_DIRECTORY, "", "", "" },
     { ":*", true, LabelPattern::DIRECTORY, "//foo/", "", "" },
@@ skipping 18 matching lines @@
     { "*:*", true, LabelPattern::RECURSIVE_DIRECTORY, "", "", "" },
     // Invalid toolchain stuff.
     { "//foo(//foo/bar:*)", false, LabelPattern::MATCH, "", "", "" },
     { "//foo/*(*)", false, LabelPattern::MATCH, "", "", "" },
     { "//foo(//bar", false, LabelPattern::MATCH, "", "", "" },
   };
 
   for (size_t i = 0; i < arraysize(cases); i++) {
     const PatternCase& cur = cases[i];
     Err err;
-    LabelPattern result =
-        LabelPattern::GetPattern(current_dir, Value(NULL, cur.input), &err);
+    LabelPattern result = LabelPattern::GetPattern(source_root, current_dir,
+                                                   Value(NULL, cur.input),
+                                                   &err);
 
     EXPECT_EQ(cur.success, !err.has_error()) << i << " " << cur.input;
     EXPECT_EQ(cur.type, result.type()) << i << " " << cur.input;
     EXPECT_EQ(cur.dir, result.dir().value()) << i << " " << cur.input;
     EXPECT_EQ(cur.name, result.name()) << i << " " << cur.input;
     EXPECT_EQ(cur.toolchain, result.toolchain().GetUserVisibleName(false))
         << i << " " << cur.input;
   }
 }