Expose a low-end device mode override flags for non-android OSs as well

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

 // Copyright 2013 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.base;
 
 import android.os.Build;
 import android.os.StrictMode;
 import android.util.Log;
 
@@ skipping 14 matching lines @@
     private static final long ANDROID_LOW_MEMORY_DEVICE_THRESHOLD_MB = 512;
 
     private static final String TAG = "SysUtils";
 
     private static Boolean sLowEndDevice;
 
     private SysUtils() { }
 
     /**
      * Return the amount of physical memory on this device in kilobytes.
-     * Note: the only reason this is public is for testability reason.
      * @return Amount of physical memory in kilobytes, or 0 if there was
      *         an error trying to access the information.
-     *
-     * Note that this is CalledByNative for testing purpose only.
      */
-    @CalledByNative
-    public static int amountOfPhysicalMemoryKB() {
+    private static int amountOfPhysicalMemoryKB() {
         // Extract total memory RAM size by parsing /proc/meminfo, note that
         // this is exactly what the implementation of sysconf(_SC_PHYS_PAGES)
         // does. However, it can't be called because this method must be
         // usable before any native code is loaded.
 
         // An alternative is to use ActivityManager.getMemoryInfo(), but this
         // requires a valid ActivityManager handle, which can only come from
         // a valid Context object, which itself cannot be retrieved
         // during early startup, where this method is called. And making it
         // an explicit parameter here makes all call paths _much_ more
@@ skipping 48 matching lines @@
     @CalledByNative
     public static boolean isLowEndDevice() {
         if (sLowEndDevice == null) {
             sLowEndDevice = detectLowEndDevice();
         }
         return sLowEndDevice.booleanValue();
     }
 
     private static boolean detectLowEndDevice() {
         if (CommandLine.isInitialized()) {
-            if (CommandLine.getInstance().hasSwitch(BaseSwitches.ENABLE_LOW_END_DEVICE_MODE)) {
-                return true;
-            }
-            if (CommandLine.getInstance().hasSwitch(BaseSwitches.DISABLE_LOW_END_DEVICE_MODE)) {
-                return false;
+            if (CommandLine.getInstance().hasSwitch(BaseSwitches.LOW_END_DEVICE_MODE)) {
+                int mode = Integer.parseInt(CommandLine.getInstance().getSwitchValue(
+                  BaseSwitches.LOW_END_DEVICE_MODE));
+                if (mode == 1)
+                    return true;
+                if (mode == 0)
+                    return false;
             }
         }
 
         if (Build.VERSION.SDK_INT <= ANDROID_LOW_MEMORY_ANDROID_SDK_THRESHOLD) {
             return false;
         }
 
         int ramSizeKB = amountOfPhysicalMemoryKB();
         return (ramSizeKB > 0 && ramSizeKB / 1024 < ANDROID_LOW_MEMORY_DEVICE_THRESHOLD_MB);
     }
 }