Android: Add chrome-specific dynamic linker.

base/android/sys_utils.cc

 // 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.
 
 #include "base/android/sys_utils.h"
 
 #include "base/sys_info.h"
 #include "jni/SysUtils_jni.h"
 
-const int64 kLowEndMemoryThreshold = 1024 * 1024 * 512; // 512 mb.
+// Any device that reports a physical RAM size less than this, in megabytes
+// is considered 'low-end'. IMPORTANT: Read the LinkerLowMemoryThresholdTest
+// comments in build/android/pylib/linker/test_case.py before modifying this
+// value.
+#define ANDROID_LOW_MEMORY_DEVICE_THRESHOLD_MB 512
+
+const int64 kLowEndMemoryThreshold =
+    1024 * 1024 * ANDROID_LOW_MEMORY_DEVICE_THRESHOLD_MB;
 
 // Defined and called by JNI
 static jboolean IsLowEndDevice(JNIEnv* env, jclass clazz) {
   return base::android::SysUtils::IsLowEndDevice();
 }
 
 namespace base {
 namespace android {
 
 bool SysUtils::Register(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 bool SysUtils::IsLowEndDevice() {
   return SysInfo::AmountOfPhysicalMemory() <= kLowEndMemoryThreshold;
 }
 
 SysUtils::SysUtils() { }
 
 }  // namespace android
 }  // namespace base