Receive app notifications in SimpleCache, so we save our index file

net/android/java/src/org/chromium/net/SimpleCacheActivityStatusNotifier.java

Index: net/android/java/src/org/chromium/net/SimpleCacheActivityStatusNotifier.java
diff --git a/net/android/java/src/org/chromium/net/SimpleCacheActivityStatusNotifier.java b/net/android/java/src/org/chromium/net/SimpleCacheActivityStatusNotifier.java
new file mode 100644
index 0000000000000000000000000000000000000000..626b335f011e0aa02f7e8c0ac23f610d53c8bd93
--- /dev/null
+++ b/net/android/java/src/org/chromium/net/SimpleCacheActivityStatusNotifier.java
@@ -0,0 +1,48 @@
+// Copyright (c) 2012 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.
+
+package org.chromium.net;
+
+import android.util.Log;
+
+import org.chromium.base.ActivityStatus;
+import org.chromium.base.CalledByNative;
+import org.chromium.base.JNINamespace;
+import org.chromium.base.NativeClassQualifiedName;
+
+/**
+ * Used by the SimpleIndex in net/disk_cache/simple/ to listens to changes in
+ * the android app state such as the app going to the background or foreground.
+ */
+//  extends BroadcastReceiver
+public class SimpleCacheActivityStatusNotifier
+        implements ActivityStatus.StateListener {
+    @CalledByNative
+    static public SimpleCacheActivityStatusNotifier NewInstance(int nativePtr) {
+      return new SimpleCacheActivityStatusNotifier(nativePtr);
+    }
+
+    public SimpleCacheActivityStatusNotifier(int nativePtr) {
+        this.mNativePtr = nativePtr;
+        ActivityStatus.registerStateListener(this);
+    }
+
+    // ActivityStatus.StateListener
+    @Override
+    public void onActivityStateChange(int state) {
+        if (state == ActivityStatus.RESUMED ||
+            state == ActivityStatus.PAUSED ||
+            state == ActivityStatus.STOPPED ||
+            state == ActivityStatus.DESTROYED) {
+          assert mNativePtr != 0;
+          nativeNotifyActivityStatusChanged(mNativePtr, state);
+        }
+    }
+
+    @NativeClassQualifiedName("net::SimpleCacheActivityStatusNotifier")
+    private native void nativeNotifyActivityStatusChanged(int nativePtr, int newActivityStatus);
+
+    // Pointer to native object.
+    private int mNativePtr = 0;
+}