Changes threshold frequency for investigation (based on video in the bug)

ash/common/shelf/wm_shelf.cc

Index: ash/common/shelf/wm_shelf.cc
diff --git a/ash/common/shelf/wm_shelf.cc b/ash/common/shelf/wm_shelf.cc
index e439381929be6836869bb732665d2bf36d8c5d57..c46e6c5cfa2848cb01eca47b8a3c0bbb07bff720 100644
--- a/ash/common/shelf/wm_shelf.cc
+++ b/ash/common/shelf/wm_shelf.cc
@@ -168,11 +168,11 @@ void WmShelf::SetAutoHideBehavior(ShelfAutoHideBehavior auto_hide_behavior) {
 
   // Force a stack dump when this method is invoked too frequently.
   // This block is here temporary to help investigate http://crbug.com/665093 .
-  constexpr int kAutoHideRepeatInterval = 10000;
-  constexpr int kMaxAutoHideChangesIn10Seconds = 100;
+  constexpr int kAutoHideRepeatInterval = 15000;
+  constexpr int kMaxAutoHideChanges = 15;
   if ((base::TimeTicks::Now() - time_last_auto_hide_change_).InMilliseconds() <
       kAutoHideRepeatInterval) {

[varkha, 2016/12/14 16:50:54]

This actually feels wrong. My intention was to CHECK when number of events in
interval is > threshold. Both current and suggested code is doing something very
different so both are prone to being triggered manually. I will need to rework
this and also make the test that repeatedly swipes up and down on the shelf take
this into account.

[varkha, 2016/12/19 21:48:50]

Done.

-    if (++count_auto_hide_changes_ > kMaxAutoHideChangesIn10Seconds)
+    if (++count_auto_hide_changes_ > kMaxAutoHideChanges)
       CHECK(false);
   } else {
     count_auto_hide_changes_ = 0;