Add dlmalloc from Bionic to the Chromium tree (DO NOT REVIEW).

third_party/android_debug_dlmalloc/chromium/dlmalloc.cc

+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "dlmalloc.h"
+
+// Ugly inclusion of C file so that bionic specific #defines configure dlmalloc.
+#include "malloc.cc"