* Change output of trace_event log to JSON to enable easier integration with visualization UI.
* Simple (manual) trace visualizer with some sample data.
* a few more trace events
* add process_util function for current process handle

Review URL: http://codereview.chromium.org/3086

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@2381 0039d316-1c4b-4281-b951-d872f2087c98

• base/process_util.h[diff]
• base/process_util_posix.cc[diff]
• base/process_util_win.cc[diff]
• base/trace_event.cc[diff]
• base/trace_event.h[diff]
• net/base/tcp_client_socket.cc[diff]
• net/http/http_network_transaction.cc[diff]
• tools/trace/trace.html[Added - diff]
• tools/trace/trace_data.js[Added - diff]