Add @MainDex annotation to SysUtils

SysUtils has to be in main dex file since child processes use
SysInfo::IsLowEndDevice() which depends on it.

Bug: 1018167
Change-Id: I61c2a040e1ccb78725c852bcabe31cf45f217522
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879896
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709453}

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

@@ -16,6 +16,7 @@ import android.util.Log;
 
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
+import org.chromium.base.annotations.MainDex;
 import org.chromium.base.annotations.NativeMethods;
 import org.chromium.base.metrics.CachedMetrics;
 
@@ -28,6 +29,7 @@ import java.util.regex.Pattern;
  * Exposes system related information about the current device.
  */
 @JNINamespace("base::android")
+@MainDex
 public class SysUtils {
     // A device reporting strictly more total memory in megabytes cannot be considered 'low-end'.
     private static final int ANDROID_LOW_MEMORY_DEVICE_THRESHOLD_MB = 512;