Allow creation and modification of scopes in GN.

tools/gn/scope_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/input_file.h"
 #include "tools/gn/parse_tree.h"
 #include "tools/gn/scope.h"
 #include "tools/gn/template.h"
 #include "tools/gn/test_with_scope.h"
@@ skipping 244 matching lines @@
   const Scope* const_root_scope = &root_scope;
   Scope mutable_scope1(const_root_scope);
   mutable_scope1.SetValue(kOnMutable1, value, &assignment);
 
   // Create a second nested scope with a different value.
   Scope mutable_scope2(&mutable_scope1);
   mutable_scope2.SetValue(kOnMutable2, value, &assignment);
 
   // Check getting root scope values.
   EXPECT_TRUE(mutable_scope2.GetValue(kOnConst, true));
-  EXPECT_FALSE(mutable_scope2.GetMutableValue(kOnConst, true));
+  EXPECT_FALSE(mutable_scope2.GetMutableValue(
+      kOnConst, Scope::SEARCH_NESTED, true));
 
   // Test reading a value from scope 1.
-  Value* mutable1_result = mutable_scope2.GetMutableValue(kOnMutable1, false);
+  Value* mutable1_result = mutable_scope2.GetMutableValue(
+      kOnMutable1, Scope::SEARCH_NESTED, false);
   ASSERT_TRUE(mutable1_result);
   EXPECT_TRUE(*mutable1_result == value);
 
   // Make sure CheckForUnusedVars works on scope1 (we didn't mark the value as
   // used in the previous step).
   Err err;
   EXPECT_FALSE(mutable_scope1.CheckForUnusedVars(&err));
-  mutable1_result = mutable_scope2.GetMutableValue(kOnMutable1, true);
+  mutable1_result = mutable_scope2.GetMutableValue(
+      kOnMutable1, Scope::SEARCH_NESTED, true);
   EXPECT_TRUE(mutable1_result);
   err = Err();
   EXPECT_TRUE(mutable_scope1.CheckForUnusedVars(&err));
 
   // Test reading a value from scope 2.
-  Value* mutable2_result = mutable_scope2.GetMutableValue(kOnMutable2, true);
+  Value* mutable2_result = mutable_scope2.GetMutableValue(
+      kOnMutable2, Scope::SEARCH_NESTED, true);
   ASSERT_TRUE(mutable2_result);
   EXPECT_TRUE(*mutable2_result == value);
 }
 
 TEST(Scope, RemovePrivateIdentifiers) {
   TestWithScope setup;
   setup.scope()->SetValue("a", Value(nullptr, true), nullptr);
   setup.scope()->SetValue("_b", Value(nullptr, true), nullptr);
 
   setup.scope()->RemovePrivateIdentifiers();
   EXPECT_TRUE(setup.scope()->GetValue("a"));
   EXPECT_FALSE(setup.scope()->GetValue("_b"));
 }