linux: TCMalloc-based C++ heap profiler.

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

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=31688

[willchan no longer on Chromium, 2009-11-11 19:25:53]

Reviewers: Vitaly,

Description:
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

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=31688

Please review this at http://codereview.chromium.org/390015

Affected files:
   M base/base.gyp
   M build/common.gypi
   A webkit/extensions/v8/heap_profiler_extension.h
   A webkit/extensions/v8/heap_profiler_extension.cc
   M webkit/tools/test_shell/test_shell_main.cc
   M webkit/tools/test_shell/test_shell_switches.h
   M webkit/tools/test_shell/test_shell_switches.cc
   M webkit/webkit.gyp

[Vitaly Repeshko, 2009-11-11 21:17:51]

LGTM. Thanks!