Add MemoryStateListenerAndroid

components/memory_coordinator/android/memory_state_listener_android.h

Index: components/memory_coordinator/android/memory_state_listener_android.h
diff --git a/components/memory_coordinator/android/memory_state_listener_android.h b/components/memory_coordinator/android/memory_state_listener_android.h
new file mode 100644
index 0000000000000000000000000000000000000000..fda12f7afc9175505d6a3e949bb353611f9f7200
--- /dev/null
+++ b/components/memory_coordinator/android/memory_state_listener_android.h
@@ -0,0 +1,31 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_MEMORY_COORDINATOR_ANDROID_MEMORY_STATE_LISTENER_ANDROID_H_
+#define COMPONENTS_MEMORY_COORDINATOR_ANDROID_MEMORY_STATE_LISTENER_ANDROID_H_
+
+#include <jni.h>
+
+namespace memory_coordinator {
+
+// C++ counterpart of ComponentCallbacks2. Only supports OnTrimMemory().
+class MemoryStateListenerAndroidDelegate {
+ public:
+  virtual void OnTrimMemory(int level) = 0;
+};
+
+// JNI bindings to connect ComponentCallback2 with memory coordinator.
+class MemoryStateListenerAndroid {
+ public:
+  static bool Register(JNIEnv* env);
+
+  static void Start(MemoryStateListenerAndroidDelegate* delegate);
+  static void Stop();
+
+  static void SimulateOnTrimMemory(int level);
+};
+
+}  // namespace memory_coordinator
+
+#endif  // COMPONENTS_MEMORY_COORDINATOR_ANDROID_MEMORY_STATE_LISTENER_ANDROID_H_