Use CategoryFilter::kDefaultCategoryFilterString instead of "*" as the default category

content/browser/android/tracing_controller_android.cc

Index: content/browser/android/tracing_controller_android.cc
diff --git a/content/browser/android/tracing_controller_android.cc b/content/browser/android/tracing_controller_android.cc
index d2fd74f0962558d0ace69346a395be5e01abf82c..cfa540daff5ad7c10d6db78dfca5bba55dfb8054 100644
--- a/content/browser/android/tracing_controller_android.cc
+++ b/content/browser/android/tracing_controller_android.cc
@@ -7,6 +7,7 @@
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/command_line.h"
+#include "base/debug/trace_event.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "content/browser/tracing/trace_subscriber_stdio.h"
@@ -90,6 +91,11 @@ void TracingControllerAndroid::OnTracingStopped() {
   subscriber_.reset();
 }
 
+static jstring GetDefaultCategories(JNIEnv* env, jobject obj) {
+  return base::android::ConvertUTF8ToJavaString(env,
+      base::debug::CategoryFilter::kDefaultCategoryFilterString).Release();
+}
+
 bool RegisterTracingControllerAndroid(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }