Add MemoryMonitorAndroid

content/public/android/java/src/org/chromium/content/browser/MemoryMonitorAndroid.java

Index: content/public/android/java/src/org/chromium/content/browser/MemoryMonitorAndroid.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/MemoryMonitorAndroid.java b/content/public/android/java/src/org/chromium/content/browser/MemoryMonitorAndroid.java
index 9053da8927fd739279c81716afc09ea1aa60a9f9..0fa1e03b42803ca14cda4b2365b932d51a39de0c 100644
--- a/content/public/android/java/src/org/chromium/content/browser/MemoryMonitorAndroid.java
+++ b/content/public/android/java/src/org/chromium/content/browser/MemoryMonitorAndroid.java
@@ -15,12 +15,28 @@ import org.chromium.base.annotations.JNINamespace;
  */
 @JNINamespace("content")
 class MemoryMonitorAndroid {
+    private static final ActivityManager.MemoryInfo sMemoryInfo =
+            new ActivityManager.MemoryInfo();
+
+    /**
+     * Get the current MemoryInfo from ActivityManager and invoke the native
+     * callback to populate the MemoryInfo.
+     *
+     * @param context The context of the application.
+     * @param outPtr A native output pointer to populate MemoryInfo. This is
+     * passed back to the native callback.
+     */
     @CalledByNative
-    private static ActivityManager.MemoryInfo getMemoryInfo(Context context) {
+    private static void getMemoryInfo(Context context, long outPtr) {
         ActivityManager am = (ActivityManager) context.getSystemService(
                 Context.ACTIVITY_SERVICE);
-        ActivityManager.MemoryInfo info = new ActivityManager.MemoryInfo();
-        am.getMemoryInfo(info);
-        return info;
+        am.getMemoryInfo(sMemoryInfo);
+        nativeGetMemoryInfoCallback(
+                sMemoryInfo.availMem, sMemoryInfo.lowMemory,
+                sMemoryInfo.threshold, sMemoryInfo.totalMem, outPtr);
     }
+
+    private static native void nativeGetMemoryInfoCallback(
+            long availMem, boolean lowMemory,
+            long threshold, long totalMem, long outPtr);
 }