Selectively perform JNI registration in render processes on Android.

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

Index: base/android/java/src/org/chromium/base/EarlyTraceEvent.java
diff --git a/base/android/java/src/org/chromium/base/EarlyTraceEvent.java b/base/android/java/src/org/chromium/base/EarlyTraceEvent.java
index 396e84f8d7ae6e4b1bc43170ada2732a4e0e2d17..6aa62210a1262d773a7c90a13555448812bae02c 100644
--- a/base/android/java/src/org/chromium/base/EarlyTraceEvent.java
+++ b/base/android/java/src/org/chromium/base/EarlyTraceEvent.java
@@ -9,6 +9,7 @@ import android.os.StrictMode;
 import android.os.SystemClock;
 
 import org.chromium.base.annotations.JNINamespace;
+import org.chromium.base.annotations.MainDex;
 import org.chromium.base.annotations.SuppressFBWarnings;
 
 import java.io.File;
@@ -34,6 +35,7 @@ import java.util.Map;
  *          all early events are dropped.
  */
 @JNINamespace("base::android")
+@MainDex
 public class EarlyTraceEvent {
     // Must be kept in sync with the native kAndroidTraceConfigFile.
     private static final String TRACE_CONFIG_FILENAME = "/data/local/chrome-trace-config.json";