Move Android TraceEvent interface to base

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

Index: base/android/java/src/org/chromium/base/BaseSwitches.java
diff --git a/base/android/java/src/org/chromium/base/BaseSwitches.java b/base/android/java/src/org/chromium/base/BaseSwitches.java
index 1f0ef207f3dfbf2b16e5dffa659e5b94f1c406a8..814fee72f64103a1f1648cb5f759b71618c926f0 100644
--- a/base/android/java/src/org/chromium/base/BaseSwitches.java
+++ b/base/android/java/src/org/chromium/base/BaseSwitches.java
@@ -18,6 +18,9 @@ public abstract class BaseSwitches {
     // Overrides low-end device detection, enabling low-end device optimizations.
     public static final String ENABLE_LOW_END_DEVICE_MODE = "enable-low-end-device-mode";
 
+    // Adds additional thread idle time information into the trace event output.
+    public static final String ENABLE_IDLE_TRACING = "enable-idle-tracing";
+
     // Prevent instantiation.
     private BaseSwitches() {}
 }