Move Android TraceEvent interface to base

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

Index: base/android/java/src/org/chromium/base/TraceEvent.java
diff --git a/content/public/android/java/src/org/chromium/content/common/TraceEvent.java b/base/android/java/src/org/chromium/base/TraceEvent.java
similarity index 98%
copy from content/public/android/java/src/org/chromium/content/common/TraceEvent.java
copy to base/android/java/src/org/chromium/base/TraceEvent.java
index 2b1dac00ef52df33421763227f9787eccc589d1a..d10196395ee1a3a2d7452c008b4229c398f28e10 100644
--- a/content/public/android/java/src/org/chromium/content/common/TraceEvent.java
+++ b/base/android/java/src/org/chromium/base/TraceEvent.java
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-package org.chromium.content.common;
+package org.chromium.base;
 
 import android.os.Build;
 import android.os.Looper;
@@ -11,12 +11,8 @@ import android.os.SystemClock;
 import android.util.Log;
 import android.util.Printer;
 
-import org.chromium.base.CommandLine;
-import org.chromium.base.ThreadUtils;
-
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
-
 /**
  * Java mirror of Chrome trace event API. See base/debug/trace_event.h.  Unlike the native version,
  * Java does not have stack objects, so a TRACE_EVENT() which does both TRACE_EVENT_BEGIN() and
@@ -24,6 +20,7 @@ import java.lang.reflect.Method;
  * It is OK to use tracing before the native library has loaded, but such traces will
  * be ignored. (Perhaps we could devise to buffer them up in future?).
  */
+@JNINamespace("base::android")
 public class TraceEvent {
 
     private static volatile boolean sEnabled = false;
@@ -168,7 +165,7 @@ public class TraceEvent {
     // Holder for monitor avoids unnecessary construction on non-debug runs
     private static final class LooperMonitorHolder {
         private static final BasicLooperMonitor sInstance =
-                CommandLine.getInstance().hasSwitch(ContentSwitches.ENABLE_IDLE_TRACING) ?
+                CommandLine.getInstance().hasSwitch(BaseSwitches.ENABLE_IDLE_TRACING) ?
                         new IdleTracingLooperMonitor() : new BasicLooperMonitor();
     }