Add string-based IDs for event log visualizer graphs and update command line flags.

The IDs be more stable than the plot titles and could be used to identify specific graphs in scripts.

Change event_log_visualizer command line interface to control which plots are generated.
Old interface had one command line flag per plot as well as a set of 'profiles' that enabled
of disabled sets of plots. New interface has a command line flag
which takes a string of all the plot names or profiles that should be enabled.
In some cases, there are also slight naming changes for the plots.

For example, the former command
event_log_visualizer --plot_profile=sendside_bwe --plot_incoming_packet_sizes <filename> | python
is now
event_log_visualizer --plot=sendside_bwe,incoming_packet_sizes <filename> | python

The former command
event_log_visualizer --plot_profile=none --plot_incoming_packet_sizes <filename> | python
is now
event_log_visualizer --plot=incoming_packet_sizes <filename> | python

The former command
event_log_visualizer --plot_profile=all <filename> | python
is now
event_log_visualizer --plot=all <filename> | python


Bug: webrtc:10623
Change-Id: Ife432c1e51edfce64af565a769f1764a16655bb6
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/140886
Reviewed-by: Sebastian Jansson <srte@webrtc.org>
Commit-Queue: Björn Terelius <terelius@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28237}
diff --git a/rtc_tools/BUILD.gn b/rtc_tools/BUILD.gn
index 790fe66..2cd4991 100644
--- a/rtc_tools/BUILD.gn
+++ b/rtc_tools/BUILD.gn
@@ -360,6 +360,7 @@
         "../test:field_trial",
         "../test:fileutils",
         "../test:test_support",
+        "//third_party/abseil-cpp/absl/algorithm:container",
       ]
     }
   }