Enable Tracing on content shell for Android

content/shell/android/java/src/org/chromium/content_shell/TraceController.java

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.content_shell;
+
+import org.chromium.base.JNINamespace;
+
+@JNINamespace("content")

[Ted C, 2012/12/26 16:18:28]

class level javadoc needed

+public class TraceController {
+
+    /**
+     * Begin to record trace event.

[Ted C, 2012/12/26 16:18:28]

Begin recording trace events.

+     *
+     * @param path Where the trace data will save when stop tracing.

[Ted C, 2012/12/26 16:18:28]

Specifies where the trace data will be saved when tracing is stopped.

+     */
+    public static void beginTracing(String path) {
+        nativeBeginTracing(path);
+    }
+
+    /**
+     * Stop recording trace event, and dump data to file

[Ted C, 2012/12/26 16:18:28]

event[s], and dump [the] data to the file.

+     */
+    public static void endTracing() {
+        nativeEndTracing();
+    }
+
+    private static native void nativeBeginTracing(String path);
+    private static native void nativeEndTracing();
+}