Add MemoryStateListenerAndroid

components/memory_coordinator/child/child_memory_coordinator_impl_android.cc

Index: components/memory_coordinator/child/child_memory_coordinator_impl_android.cc
diff --git a/components/memory_coordinator/child/child_memory_coordinator_impl_android.cc b/components/memory_coordinator/child/child_memory_coordinator_impl_android.cc
index 976994c19850e5cc3030a9461a7dc9c246a4d861..c06adacda46b54dacff2d465a713726f7b24c292 100644
--- a/components/memory_coordinator/child/child_memory_coordinator_impl_android.cc
+++ b/components/memory_coordinator/child/child_memory_coordinator_impl_android.cc
@@ -6,17 +6,25 @@
 
 namespace memory_coordinator {
 
+// The same value as TRIM_MEMORY_RUNNING_CRITICAL defined in
+// ComponentCallback2
+static const int kTrimMemoryRunningCritical = 15;
+
 ChildMemoryCoordinatorImplAndroid::ChildMemoryCoordinatorImplAndroid(
     mojom::MemoryCoordinatorHandlePtr parent,
     ChildMemoryCoordinatorDelegate* delegate)
-    : ChildMemoryCoordinatorImpl(std::move(parent), delegate) {}
+    : ChildMemoryCoordinatorImpl(std::move(parent), delegate) {
+  MemoryStateListenerAndroid::Start(this);
+}
 
-ChildMemoryCoordinatorImplAndroid::~ChildMemoryCoordinatorImplAndroid() {}
+ChildMemoryCoordinatorImplAndroid::~ChildMemoryCoordinatorImplAndroid() {
+  MemoryStateListenerAndroid::Stop();
+}
 
 void ChildMemoryCoordinatorImplAndroid::OnTrimMemory(int level) {
-  // TODO(bashi): Compare |level| with levels defined in
-  // ComponentCallbacks2 when JNI bindings are implemented.
-  delegate()->OnTrimMemoryImmediately();
+  if (level >= kTrimMemoryRunningCritical) {
+    delegate()->OnTrimMemoryImmediately();
+  }
 }
 
 std::unique_ptr<ChildMemoryCoordinatorImpl> CreateChildMemoryCoordinator(