Separate the JNI function that controls logging levels into two.

webrtc/base/java/src/org/webrtc/Logging.java

Index: webrtc/base/java/src/org/webrtc/Logging.java
diff --git a/webrtc/base/java/src/org/webrtc/Logging.java b/webrtc/base/java/src/org/webrtc/Logging.java
index ea1bca3bdb18fd99a6885226254531acd647dcd7..684e5bc5b20b762f57f38c295055aa467fc31e42 100644
--- a/webrtc/base/java/src/org/webrtc/Logging.java
+++ b/webrtc/base/java/src/org/webrtc/Logging.java
@@ -20,6 +20,7 @@ import java.util.logging.Level;
 public class Logging {
   private static final Logger fallbackLogger = Logger.getLogger("org.webrtc.Logging");
   private static volatile boolean tracingEnabled;
+  private static volatile boolean loggingEnabled;
   private static volatile boolean nativeLibLoaded;
 
   static {
@@ -60,7 +61,7 @@ public class Logging {
 
   // Keep in sync with webrtc/base/logging.h:LoggingSeverity.
   public enum Severity {
-    LS_SENSITIVE, LS_VERBOSE, LS_INFO, LS_WARNING, LS_ERROR,
+    LS_SENSITIVE, LS_VERBOSE, LS_INFO, LS_WARNING, LS_ERROR, LS_NONE
   };
 
   public static void enableLogThreads() {
@@ -80,10 +81,11 @@ public class Logging {
     nativeEnableLogTimeStamps();
   }
 
-  // Enable tracing to |path| of messages of |levels| and |severity|.
+  // Enable tracing to |path| of messages of |levels|.
   // On Android, use "logcat:" for |path| to send output there.
+  // Note: this function controls the output of the WEBRTC_TRACE() macros.
   public static synchronized void enableTracing(
-      String path, EnumSet<TraceLevel> levels, Severity severity) {
+      String path, EnumSet<TraceLevel> levels) {
     if (!nativeLibLoaded) {
       fallbackLogger.log(Level.WARNING, "Cannot enable tracing because native lib not loaded.");
       return;
@@ -96,12 +98,24 @@ public class Logging {
     for (TraceLevel level : levels) {
       nativeLevel |= level.level;
     }
-    nativeEnableTracing(path, nativeLevel, severity.ordinal());
+    nativeEnableTracing(path, nativeLevel);
     tracingEnabled = true;
   }
 
+  // Enable diagnostic logging for messages of |severity| to the platform debug
+  // output. On Android, the output will be directed to Logcat.
+  // Note: this function starts collecting the output of the LOG() macros.
+  public static synchronized void enableLogToDebugOutput(Severity severity) {
+    if (!nativeLibLoaded) {
+      fallbackLogger.log(Level.WARNING, "Cannot enable logging because native lib not loaded.");
+      return;
+    }
+    nativeEnableLogToDebugOutput(severity.ordinal());
+    loggingEnabled = true;
+  }
+
   public static void log(Severity severity, String tag, String message) {
-    if (tracingEnabled) {
+    if (loggingEnabled) {
       nativeLog(severity.ordinal(), tag, message);
       return;
     }
@@ -165,7 +179,8 @@ public class Logging {
   }
 
   private static native void nativeEnableTracing(
-      String path, int nativeLevels, int nativeSeverity);
+      String path, int nativeLevels);
+  private static native void nativeEnableLogToDebugOutput(int nativeSeverity);
   private static native void nativeEnableLogThreads();
   private static native void nativeEnableLogTimeStamps();
   private static native void nativeLog(int severity, String tag, String message);