[remoting host] Increase X session logging timeout.

Only the first 30 seconds of the X11 session logs are kept. This
increases it to 5 minutes to capture more debugging output from the
session. For example, some session programs may be started more than
30s into the session (because of an X-GNOME-Autostart-Delay key or
the session is slow to start), and it can be helpful to see the
initial output from all startup programs.

Bug: 749215
Change-Id: I12ba7ca252719e6fba36afcd8995049c29204ec3
Reviewed-on: https://chromium-review.googlesource.com/1103542
Commit-Queue: Lambros Lambrou <lambroslambrou@chromium.org>
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575757}

remoting/host/linux/linux_me2me_host.py

@@ -117,7 +117,7 @@ SHORT_BACKOFF_THRESHOLD = 5
 MAX_LAUNCH_FAILURES = SHORT_BACKOFF_THRESHOLD + 10
 
 # Number of seconds to save session output to the log.
-SESSION_OUTPUT_TIME_LIMIT_SECONDS = 30
+SESSION_OUTPUT_TIME_LIMIT_SECONDS = 300
 
 # Host offline reason if the X server retry count is exceeded.
 HOST_OFFLINE_REASON_X_SERVER_RETRIES_EXCEEDED = "X_SERVER_RETRIES_EXCEEDED"