New rtc dump analyzing tool in Python

tools/py_event_log_analyzer/README

Index: tools/py_event_log_analyzer/README
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+This file describes how to set up and use the RTP log analyzer.
+
+Run the tool as follows:
+
+    python rtp_analyzer.py <rtc event log>

[phoglund, 2016/06/03 08:11:07]

Update the instructions when you settle on how to invoke the tool.

[aleloi, 2016/06/09 12:00:44]

Done.

+
+where <rtc event log> is a recorded RTC event log, which is stored in
+protobuf format. Such logs are generated in multiple ways, e.g. by
+Chrome through the chrome://webrtc-internals page.
+
+The script has been tested to work in python versions 3.4.1 and 2.7.6,
+but should work in all python versions for which there is a version
+of the dependencies.
+
+Dependencies

[phoglund, 2016/06/03 08:11:07]

This should not be needed, but should be handled by the build system. The
exception would the the instructions on how to replace the proto file in case
anyone wants that.

[aleloi, 2016/06/09 12:00:44]

Done.

+------------
+
+The analyzer script needs *numpy* (http://www.numpy.org/) and
+*matplotlib* (http://matplotlib.org/).
+
+A version of Protocol Buffers is needed as well. One is distributed
+along with WebRTC in `thirdparty/protobuf/python`. This tool also
+needs a file `rtc_event_log_pb2.py` which is automatically generated
+from `webrtc/call/rtc_event_log.proto` and placed in
+`out/<TARGET>/pyproto/webrtc/call/` with every WebRTC compilation. To
+use it, WebRTC needs to be compiled before using this tool.
+
+An alternative to compiling WebRTC is to install your own version of
+Protocol Buffers and `protoc`, the Protocol Buffer compiler.
+
+If you use your own version of protobuf, generate the python file in
+this folder with
+
+   protoc -I $WEBRTC_ROOT/webrtc/call $WEBRTC_ROOT/webrtc/call/rtc_event_log.proto --python_out ./
+