Linux: add gyp flag for enabling tcmalloc.

third_party/tcmalloc/google/tcmalloc.h

Index: third_party/tcmalloc/google/tcmalloc.h
diff --git a/third_party/tcmalloc/google/tcmalloc.h b/third_party/tcmalloc/google/tcmalloc.h
new file mode 100644
index 0000000000000000000000000000000000000000..90dc0fea3f9a23a5e429e1c081cbd47adccad36b
--- /dev/null
+++ b/third_party/tcmalloc/google/tcmalloc.h
@@ -0,0 +1,80 @@
+/* Copyright (c) 2003, Google Inc.
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * ---
+ * Author: Sanjay Ghemawat <opensource@google.com>
+ *         .h file by Craig Silverstein <opensource@google.com>
+ */
+
+#ifndef TCMALLOC_TCMALLOC_H_
+#define TCMALLOC_TCMALLOC_H_
+
+// __THROW is defined in glibc systems.  It means, counter-intuitively,
+// "This function will never throw an exception."  It's an optional
+// optimization tool, but we may need to use it to match glibc prototypes.
+#ifndef __THROW    /* I guess we're not on a glibc system */
+# define __THROW   /* __THROW is just an optimization, so ok to make it "" */
+#endif
+
+#include <stdlib.h>   // for struct mallinfo, if it's defined
+
+#ifdef __cplusplus
+#include <new>  // for nothrow_t
+extern "C" {
+#endif
+  void* tc_malloc(size_t size) __THROW;
+  void tc_free(void* ptr) __THROW;
+  void* tc_realloc(void* ptr, size_t size) __THROW;
+  void* tc_calloc(size_t nmemb, size_t size) __THROW;
+  void tc_cfree(void* ptr) __THROW;
+
+  void* tc_memalign(size_t __alignment, size_t __size) __THROW;
+  int tc_posix_memalign(void** ptr, size_t align, size_t size) __THROW;
+  void* tc_valloc(size_t __size) __THROW;
+  void* tc_pvalloc(size_t __size) __THROW;
+
+  void tc_malloc_stats(void) __THROW;
+  int tc_mallopt(int cmd, int value) __THROW;
+// TODO(willchan): Fork this for Linux/Windows if we need this on Linux.
+#if 0
+  struct mallinfo tc_mallinfo(void) __THROW;
+#endif
+
+#ifdef __cplusplus
+  void* tc_new(size_t size);
+  void tc_delete(void* p) __THROW;
+  void* tc_newarray(size_t size);
+  void tc_deletearray(void* p) __THROW;
+
+  void* tc_new_nothrow(size_t size, const std::nothrow_t&) __THROW;
+  void* tc_newarray_nothrow(size_t size, const std::nothrow_t&) __THROW;
+}
+#endif
+
+#endif  // #ifndef TCMALLOC_TCMALLOC_H_