Postmortem report collection: validate internal state

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 9f40d834e79450ea350d9ae8545cb19ae2e72de7..f1030d3d9abbf242aa1aa215abfa7be6aa70a319 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -371,6 +371,15 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="ActivityTracker.Collect.IsAllocatorFull" enum="Boolean">
+  <owner>manzagop@chromium.org</owner>
+  <summary>
+    Whether the persistent memory allocator had an allocation failure due to the
+    memory segment being full. Logged once for each processed stability file for
+    each valid file (initialized, not deleted or corrupt).
+  </summary>
+</histogram>
+
 <histogram name="ActivityTracker.Collect.StabilityFileCount" units="count">
   <owner>manzagop@chromium.org</owner>
   <summary>
@@ -80853,6 +80862,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="5" label="Write to minidump failed"/>
   <int value="6" label="Debug file deletion failed"/>
   <int value="7" label="Finished writing crash report failed"/>
+  <int value="8" label="Persistent memory allocator is marked corrupt"/>
+  <int value="9" label="Persistent memory allocator is marked uninitialized"/>
+  <int value="10" label="Persistent memory allocator is marked deleted"/>
 </enum>
 
 <enum name="ActivityTrackerRecordInitStatus" type="int">