make gn label unit tests pass again

tools/gn/label_unittest.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 "testing/gtest/include/gtest/gtest.h"
 #include "tools/gn/err.h"
 #include "tools/gn/label.h"
 #include "tools/gn/value.h"
 
 namespace {
@@ skipping 12 matching lines @@
 
 TEST(Label, Resolve) {
   ParseDepStringCase cases[] = {
       // cur         input                        succ   expected dir          name    tc dir    tc name
       { "//chrome/", "",                          false, "",                   "",     "",       "" },
       { "//chrome/", "/",                         false, "",                   "",     "",       "" },
       { "//chrome/", ":",                         false, "",                   "",     "",       "" },
       { "//chrome/", "/:",                        false, "",                   "",     "",       "" },
       { "//chrome/", "blah",                      true,  "//chrome/blah/",     "blah", "//t/",   "d" },
       { "//chrome/", "blah:bar",                  true,  "//chrome/blah/",     "bar",  "//t/",   "d" },
-      // No single-leading slash.
-      { "//chrome/", "/chrome:bar",               false, "",                   "",     "",       "" },
-      // No trailing slash.
-      { "//chrome/", "/chrome/:bar",              false, "",                   "",     "",       "" },
+      // Absolute paths.
+      { "//chrome/", "/chrome:bar",               true , "/chrome/",           "bar",  "//t/",   "d" },
+      { "//chrome/", "/chrome/:bar",              true,  "/chrome/",           "bar",  "//t/",   "d" },
       // Refers to root dir.
       { "//chrome/", "//:bar",                    true,  "//",                 "bar",  "//t/",   "d" },
       // Implicit directory
       { "//chrome/", ":bar",                      true,  "//chrome/",          "bar",  "//t/",   "d" },
       { "//chrome/renderer/", ":bar",             true,  "//chrome/renderer/", "bar",  "//t/",   "d" },
       // Implicit names.
       { "//chrome/", "//base",                    true,  "//base/",            "base", "//t/",   "d" },
       { "//chrome/", "//base/i18n",               true,  "//base/i18n/",       "i18n", "//t/",   "d" },
       { "//chrome/", "//base/i18n:foo",           true,  "//base/i18n/",       "foo",  "//t/",   "d" },
       { "//chrome/", "//",                        false, "",                   "",     "",       "" },
       // Toolchain parsing.
       { "//chrome/", "//chrome:bar(//t:n)",       true,  "//chrome/",          "bar",  "//t/",   "n" },
       { "//chrome/", "//chrome:bar(//t)",         true,  "//chrome/",          "bar",  "//t/",   "t" },
       { "//chrome/", "//chrome:bar(//t:)",        true,  "//chrome/",          "bar",  "//t/",   "t" },
       { "//chrome/", "//chrome:bar()",            true,  "//chrome/",          "bar",  "//t/",   "d" },
       { "//chrome/", "//chrome:bar(foo)",         true,  "//chrome/",          "bar",  "//chrome/foo/", "foo" },
       { "//chrome/", "//chrome:bar(:foo)",        true,  "//chrome/",          "bar",  "//chrome/",     "foo" },
       // TODO(brettw) it might be nice to make this an error:
       //{ "//chrome/", "//chrome:bar())",           false, "",                   "",     "",       "" },
       { "//chrome/", "//chrome:bar(//t:bar(tc))", false, "",                   "",     "",       "" },
       { "//chrome/", "//chrome:bar(()",           false, "",                   "",     "",       "" },
       { "//chrome/", "(t:b)",                     false, "",                   "",     "",       "" },
       { "//chrome/", ":bar(//t/b)",               true,  "//chrome/",          "bar",  "//t/b/", "b" },
-      { "//chrome/", ":bar(/t/b)",                false, "",                   "",     "",       "" },
+      { "//chrome/", ":bar(/t/b)",                true,  "//chrome/",          "bar",  "/t/b/",  "b" },
       { "//chrome/", ":bar(t/b)",                 true,  "//chrome/",          "bar",  "//chrome/t/b/", "b" },
   };
 
   Label default_toolchain(SourceDir("//t/"), "d");
 
   for (size_t i = 0; i < arraysize(cases); i++) {
     const ParseDepStringCase& cur = cases[i];
 
     std::string location, name;
     Err err;
     Value v(nullptr, Value::STRING);
     v.string_value() = cur.str;
     Label result =
         Label::Resolve(SourceDir(cur.cur_dir), default_toolchain, v, &err);
     EXPECT_EQ(cur.success, !err.has_error()) << i << " " << cur.str;
     if (!err.has_error() && cur.success) {
       EXPECT_EQ(cur.expected_dir, result.dir().value())
           << i << " " << cur.str;
       EXPECT_EQ(cur.expected_name, result.name())
           << i << " " << cur.str;
       EXPECT_EQ(cur.expected_toolchain_dir,
                 result.toolchain_dir().value())
           << i << " " << cur.str;
       EXPECT_EQ(cur.expected_toolchain_name, result.toolchain_name())
           << i << " " << cur.str;
     }
   }
 }