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

base/android/java/src/org/chromium/base/SysUtils.java

Index: base/android/java/src/org/chromium/base/SysUtils.java
diff --git a/base/android/java/src/org/chromium/base/SysUtils.java b/base/android/java/src/org/chromium/base/SysUtils.java
index 04a833257f53792eb1c1b379941b8070b13e1443..cc5a32cfded7608838bd77dcab3eafb09f3d801a 100644
--- a/base/android/java/src/org/chromium/base/SysUtils.java
+++ b/base/android/java/src/org/chromium/base/SysUtils.java
@@ -99,6 +99,14 @@ public class SysUtils {
         return sLowEndDevice.booleanValue();
     }
 
+    /**
+     * Resets the cached value, if any.
+     */
+    @VisibleForTesting
+    public static void reset() {
+        sLowEndDevice = null;

[Pete Williamson, 2016/07/20 18:29:59]

Should reset be calling detectLowEndDevice() instead of just assuming it isn't? 
It seems that after our test, we want to restore the state that existed before
our test, not just clear the Low End Device state.

[Yaron, 2016/07/21 13:48:06]

true, but it's sorta moot. The next call to isLowEndDevice will ensure it's set

+    }
+
     private static boolean detectLowEndDevice() {
         assert CommandLine.isInitialized();
         if (CommandLine.getInstance().hasSwitch(BaseSwitches.ENABLE_LOW_END_DEVICE_MODE)) {