Restore a default timer to bench_pictures.

https://codereview.chromium.org/19862002 removed the default timer
to display from PictureBenchmark. Restore a default by putting it
in the flag description.

R=mtklein@google.com

Review URL: https://codereview.chromium.org/21567005

git-svn-id: http://skia.googlecode.com/svn/trunk@10516 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tools/bench_pictures_main.cpp b/tools/bench_pictures_main.cpp
index cd4b735..31d432d 100644
--- a/tools/bench_pictures_main.cpp
+++ b/tools/bench_pictures_main.cpp
@@ -44,7 +44,7 @@
 DEFINE_int32(repeat, 1, "Set the number of times to repeat each test.");
 DEFINE_bool(timeIndividualTiles, false, "Report times for drawing individual tiles, rather than "
             "times for drawing the whole page. Requires tiled rendering.");
-DEFINE_string(timers, "", "[wcgWC]*: Display wall, cpu, gpu, truncated wall or truncated cpu time"
+DEFINE_string(timers, "c", "[wcgWC]*: Display wall, cpu, gpu, truncated wall or truncated cpu time"
               " for each picture.");
 DEFINE_bool(trackDeferredCaching, false, "Only meaningful with --deferImageDecoding and "
             "LAZY_CACHE_STATS set to true. Report percentage of cache hits when using deferred "