linux: TCMalloc-based C++ heap profiler.

Requires compiling with linux_use_tcmalloc=1.

When enabled by --heap-profiler flag in test_shell exposes
chromium.HeapProfiler object to JavaScript. The object has three
methods:
o start() -- starts profiling
o dump() -- dumps data accumulated since start() to file
named like chromium-YYYY-MM-DD-TS.heap
o stop() -- stops profiling.

Output can be analyzed by third_party/tcmalloc/tcmalloc/src/pprof.
For example:
$ third_party/tcmalloc/tcmalloc/src/pprof \
sconsbuild/Release/test_shell \
chromium-2009-11-06-1234567890.heap

See http://code.google.com/p/google-perftools/ for details on how to
use pprof.

Patch contributed by vitalyr@chromium.org.  Original review at
http://codereview.chromium.org/377010/show.

TBR=vitalyr

Review URL: http://codereview.chromium.org/390015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@31688 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 23 insertions, 0 deletions

diff --git a/webkit/extensions/v8/heap_profiler_extension.h b/webkit/extensions/v8/heap_profiler_extension.h
new file mode 100644
index 0000000..8bdbf90
--- /dev/null
+++ b/webkit/extensions/v8/heap_profiler_extension.h
@@ -0,0 +1,23 @@
+// Copyright (c) 2006-2009 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.
+
+// HeapProfilerExtension is a V8 extension to expose a JS function for
+// dumping native heap profiles.  This should only be used for
+// debugging.
+
+#ifndef WEBKIT_EXTENSIONS_V8_HEAP_PROFILER_EXTENSION_H_
+#define WEBKIT_EXTENSIONS_V8_HEAP_PROFILER_EXTENSION_H_
+
+#include "v8/include/v8.h"
+
+namespace extensions_v8 {
+
+class HeapProfilerExtension {
+ public:
+  static v8::Extension* Get();
+};
+
+}  // namespace extensions_v8
+
+#endif  // WEBKIT_EXTENSIONS_V8_HEAP_PROFILER_EXTENSION_H_