histograms/histograms.xml

Index: histograms/histograms.xml
===================================================================
--- histograms/histograms.xml	(revision 278704)
+++ histograms/histograms.xml	(working copy)
@@ -10871,6 +10871,22 @@
   </summary>
 </histogram>
 
+<histogram name="MemoryWarning.EvictedTabTimeSinceActive" units="ms">
+  <owner>lliabraa@chromium.org</owner>
+  <summary>
+    When the OS sends a memory warning and the app evicts a tab, this histogram
+    records the time since the evicted tab was active.
+  </summary>
+</histogram>
+
+<histogram name="MemoryWarning.ProtectedTabTimeSinceActive" units="ms">
+  <owner>lliabraa@chromium.org</owner>
+  <summary>
+    When the OS sends a memory warning and the app protects a tab, this
+    histogram records the time since the protected tab was active.
+  </summary>
+</histogram>
+
 <histogram name="Mist.SwitchResult" enum="MistSwitchResult">
   <owner>benchan@chromium.org</owner>
   <summary>
@@ -30372,6 +30388,22 @@
   </summary>
 </histogram>
 
+<histogram name="Tab.TimeSinceActive" units="ms">
+  <owner>lliabraa@chromium.org</owner>
+  <summary>
+    When an existing tab becomes active, this histogram records the time since
+    it was active.
+  </summary>
+</histogram>
+
+<histogram name="Tab.TimeSinceActiveEvicted" units="ms">
+  <owner>lliabraa@chromium.org</owner>
+  <summary>
+    When an evicted tab becomes active, this histogram records the time since it
+    was active.

[Alexei Svitkine (slow), 2014/06/20 14:48:56]

Do you mean "the since it was made inactive"? Or "the time since it was
activated the previous time it was active"? Please clarify. Same for the one
above.

[lliabraa, 2014/06/26 16:46:29]

Done.

+  </summary>
+</histogram>
+
 <histogram name="Tab.TimeSinceFormActivityEvictedHistogram" units="ms">
   <owner>lliabraa@chromium.org</owner>
   <summary>