Add StateOn{Moderate,Critical}NotificationReceived metrics

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 07ed841141038e1eb0d768f034ec2c58e9dde7ab..32ddc430677f423c8406657b1b569a28dc271e1c 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -25545,6 +25545,24 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Memory.Coordinator.StateOnCriticalNotificationReceived"
+    enum="MemoryState">
+  <owner>bashi@chromium.org</owner>
+  <summary>
+    The global state of memory coordinator when a critical pressure notification
+    is received.
+  </summary>
+</histogram>
+
+<histogram name="Memory.Coordinator.StateOnModerateNotificationReceived"
+    enum="MemoryState">
+  <owner>bashi@chromium.org</owner>
+  <summary>
+    The global state of memory coordinator when a moderate pressure notification
+    is received.
+  </summary>
+</histogram>
+
 <histogram name="Memory.DiscardableAllocationSize" units="KB">
   <owner>reveman@chromium.org</owner>
   <summary>
@@ -92417,6 +92435,12 @@ value.
   <int value="5" label="Moderate pressure to no pressure"/>
 </enum>
 
+<enum name="MemoryState" type="int">
+  <int value="0" label="Normal"/>
+  <int value="1" label="Throttled"/>
+  <int value="2" label="Suspended"/>
+</enum>
+
 <enum name="MessageLoopProblems" type="int">
   <int value="0" label="Message Post"/>
   <int value="1" label="Completion Post"/>