Checked the return values of function calls.

dbus/values_util.cc

 // Copyright (c) 2012 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 "dbus/values_util.h"
 
 #include "base/json/json_writer.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/values.h"
@@ skipping 189 matching lines @@
       break;
     }
   }
   return result;
 }
 
 void AppendBasicTypeValueData(MessageWriter* writer, const base::Value& value) {
   switch (value.GetType()) {
     case base::Value::TYPE_BOOLEAN: {
       bool bool_value = false;
-      value.GetAsBoolean(&bool_value);
+      bool success = value.GetAsBoolean(&bool_value);
+      DCHECK(success);
       writer->AppendBool(bool_value);
       break;
     }
     case base::Value::TYPE_INTEGER: {
       int int_value = 0;
-      value.GetAsInteger(&int_value);
+      bool success = value.GetAsInteger(&int_value);
+      DCHECK(success);
       writer->AppendInt32(int_value);
       break;
     }
     case base::Value::TYPE_DOUBLE: {
       double double_value = 0;
-      value.GetAsDouble(&double_value);
+      bool success = value.GetAsDouble(&double_value);
+      DCHECK(success);
       writer->AppendDouble(double_value);
       break;
     }
     case base::Value::TYPE_STRING: {
       std::string string_value;
-      value.GetAsString(&string_value);
+      bool success = value.GetAsString(&string_value);
+      DCHECK(success);
       writer->AppendString(string_value);
       break;
     }
     default:
       DLOG(ERROR) << "Unexpected type " << value.GetType();
       break;
   }
 }
 
 void AppendBasicTypeValueDataAsVariant(MessageWriter* writer,
                                        const base::Value& value) {
   MessageWriter sub_writer(NULL);
   writer->OpenVariant(GetTypeSignature(value), &sub_writer);
   AppendBasicTypeValueData(&sub_writer, value);
   writer->CloseContainer(&sub_writer);
 }
 
 }  // namespace dbus