Add StateOn{Moderate,Critical}NotificationReceived metrics

content/browser/memory/memory_coordinator.cc

Index: content/browser/memory/memory_coordinator.cc
diff --git a/content/browser/memory/memory_coordinator.cc b/content/browser/memory/memory_coordinator.cc
index 517aaedc34a1a13f696d9e0532c5c4c9117458a1..38dd0edef0e9b91d55742cfa7883d529849bf719 100644
--- a/content/browser/memory/memory_coordinator.cc
+++ b/content/browser/memory/memory_coordinator.cc
@@ -5,6 +5,7 @@
 #include "content/browser/memory/memory_coordinator.h"
 
 #include "base/memory/memory_coordinator_client_registry.h"
+#include "base/metrics/histogram_macros.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/common/content_client.h"
@@ -120,6 +121,25 @@ mojom::MemoryState MemoryCoordinator::GetMemoryState(
   return iter->second.memory_state;
 }
 
+void MemoryCoordinator::RecordMemoryPressure(
+    base::MemoryPressureMonitor::MemoryPressureLevel level) {
+  int state = static_cast<int>(GetCurrentMemoryState());
+  switch (level) {
+    case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE:
+      UMA_HISTOGRAM_ENUMERATION(
+          "Memory.Coordinator.StateOnModerateNotificationReceived",
+          state, base::kMemoryStateMax);
+      break;
+    case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL:
+      UMA_HISTOGRAM_ENUMERATION(
+          "Memory.Coordinator.StateOnCriticalNotificationReceived",
+          state, base::kMemoryStateMax);
+      break;
+    case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE:
+      NOTREACHED();
+  }
+}
+
 void MemoryCoordinator::EnableFeaturesForTesting() {
   base::FeatureList::ClearInstanceForTesting();
   std::unique_ptr<base::FeatureList> feature_list(new base::FeatureList);