[OfflinePages] Do not start background loading on low-end devices if app has any visible Activities.

chrome/android/java/src/org/chromium/chrome/browser/offlinepages/BackgroundOfflinerTask.java

Index: chrome/android/java/src/org/chromium/chrome/browser/offlinepages/BackgroundOfflinerTask.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/BackgroundOfflinerTask.java b/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/BackgroundOfflinerTask.java
index 9ff42381c39b8b1f9cf03b3e20c9aee4e8217593..1df2c12d6ff2ff129ea7d5bbe32d0818a5a2f054 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/BackgroundOfflinerTask.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/BackgroundOfflinerTask.java
@@ -7,8 +7,10 @@ package org.chromium.chrome.browser.offlinepages;
 import android.content.Context;
 import android.os.Bundle;
 
+import org.chromium.base.ApplicationStatus;
 import org.chromium.base.Callback;
 import org.chromium.base.Log;
+import org.chromium.base.SysUtils;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.chrome.browser.ChromeBackgroundServiceWaiter;
 import org.chromium.chrome.browser.offlinepages.interfaces.BackgroundSchedulerProcessor;
@@ -51,6 +53,11 @@ public class BackgroundOfflinerTask {
             return false;
         }
 
+        if (SysUtils.isLowEndDevice() && ApplicationStatus.hasVisibleActivities()) {
+            Log.d(TAG, "Application visible on low-end device so deferring background processing");
+            return false;
+        }
+
         // Now initiate processing.
         processBackgroundRequests(bundle, currentConditions, waiter);