[Merge to M53] debugd: Increase the default size limit for non-capped logs

syslogs in feedback reports started to be truncated recently, due to
the increase in logs from arc++. This changes the default cap from
256K to 512K.

BUG=chrome-os-partner:56801
TEST=cros_workon_make

Change-Id: I9a1abdb72f277933f34a8a4061de7b002e504349
Reviewed-on: https://chromium-review.googlesource.com/387128
Commit-Ready: Ahmed Fakhry <afakhry@chromium.org>
Tested-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Luis Hector Chavez <lhchavez@google.com>
(cherry picked from commit e4a0b50c7dac18ec5db176a10b490f082619b9b4)
Reviewed-on: https://chromium-review.googlesource.com/389952
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Trybot-Ready: Ahmed Fakhry <afakhry@chromium.org>
diff --git a/debugd/src/log_tool.cc b/debugd/src/log_tool.cc
index ddba35a..c0273ec 100644
--- a/debugd/src/log_tool.cc
+++ b/debugd/src/log_tool.cc
@@ -240,7 +240,7 @@
   string output;
   ProcessWithOutput p;
   string tailed_cmdline = std::string(log.command) + " | tail -c " +
-                          (log.size_cap ? log.size_cap : "256K");
+                          (log.size_cap ? log.size_cap : "512K");
   if (log.user && log.group)
     p.SandboxAs(log.user, log.group);
   if (!p.Init())