value_cleanup: Rewrite more base::ListValue::Append(base::Value*) calls.

tools/clang/value_cleanup/tests/list-value-append-expected.cc

 // Copyright 2016 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 <memory>
 
 #include "base/values.h"
 
 #define true true
 
+base::ListValue* ReturnsRawPtr() {
+  return nullptr;
+}
+
 std::unique_ptr<base::Value> ReturnsUniquePtr() {
   return nullptr;
 }
 
+// The joy of raw pointers.
+void DoesItTakeOwnership(base::Value*) {}
+
 struct Thing {
   std::unique_ptr<base::Value> ToValue() { return nullptr; }
 };
 
 void F() {
   base::ListValue list;
   list.AppendBoolean(1 == 0);
   list.AppendBoolean(true);
   list.AppendInteger(static_cast<unsigned char>(1.0));
   list.AppendDouble(double{3});
   list.AppendString("abc");
 
   list.Append(ReturnsUniquePtr());
   Thing thing;
   list.Append(thing.ToValue());
   std::unique_ptr<base::Value> unique_ptr_var;
   list.Append(std::move(unique_ptr_var));
 }
+
+void G(base::Value* input) {
+  base::ListValue list;
+
+  std::unique_ptr<base::ListValue> local(new base::ListValue());
+  // Not rewritten, since it often makes more sense to change the function
+  // prototype.
+  local->Append(input);
+  // Should be rewritten: it will only be moved after it's no longer referenced.
+  list.Append(std::move(local));
+
+  // Not rewritten, since it would be used after it's moved. In theory, we could
+  // automatically handle this too, but the risk of accidentally breaking
+  // something is much higher.
+  base::ListValue* clever_list = new base::ListValue;
+  list.Append(clever_list);
+  clever_list->AppendInteger(2);
+
+  // Not rewritten, since it often makes more sense to change the function
+  // prototype.
+  base::Value* returned_value = ReturnsRawPtr();
+  list.Append(returned_value);
+
+  // Should be rewritten. The reassignment should be transformed into
+  // .reset().
+  std::unique_ptr<base::ListValue> reused_list(new base::ListValue);
+  reused_list->AppendInteger(1);
+  list.Append(std::move(reused_list));
+  reused_list.reset(new base::ListValue);
+  reused_list->AppendInteger(3);
+  list.Append(std::move(reused_list));
+
+  // This shouldn't be rewritten, since the reassignment is the return
+  // value of a function.
+  base::ListValue* reused_list_2 = new base::ListValue;
+  reused_list_2->AppendInteger(4);
+  list.Append(reused_list_2);
+  reused_list_2 = ReturnsRawPtr();
+  reused_list_2->AppendInteger(5);
+  list.Append(reused_list_2);
+
+  // auto should be expanded to a std::unique_ptr containing the deduced type.
+  std::unique_ptr<class base::ListValue> auto_list(new base::ListValue);
+  auto_list->AppendInteger(6);
+  list.Append(std::move(auto_list));
+
+  std::unique_ptr<class base::ListValue> auto_list_2(new base::ListValue);
+  auto_list_2->AppendInteger(7);
+  list.Append(std::move(auto_list_2));
+
+  // Shouldn't be rewritten: a raw pointer is passed to a function which may or
+  // may not take ownership.
+  base::ListValue* maybe_owned_list = new base::ListValue;
+  DoesItTakeOwnership(maybe_owned_list);
+  list.Append(maybe_owned_list);
+
+  // Should be rewritten, even though it doesn't have an initializer.
+  std::unique_ptr<base::ListValue> list_with_no_initializer;
+  list_with_no_initializer.reset(new base::ListValue);
+  list.Append(std::move(list_with_no_initializer));
+
+  // Make sure C++98 style initialization is correctly handled.
+  std::unique_ptr<base::ListValue> cxx98_list(new base::ListValue);
+  list.Append(std::move(cxx98_list));
+
+  // C++11 style syntax currently causes the tool to bail out: this is banned in
+  // Chromium style anyway.
+  base::ListValue* cxx11_list{new base::ListValue};
+  list.Append(cxx11_list);
+}