Enable Tracing on content shell for Android

content/browser/android/tracing_intent_handler.cc

Index: content/browser/android/tracing_intent_handler.cc
diff --git a/content/browser/android/tracing_intent_handler.cc b/content/browser/android/tracing_intent_handler.cc
new file mode 100644
index 0000000000000000000000000000000000000000..2b44a461f02ca4460e9bd7357e81e1a1d6cbb664
--- /dev/null
+++ b/content/browser/android/tracing_intent_handler.cc
@@ -0,0 +1,53 @@
+// 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.
+
+#include "content/browser/android/tracing_intent_handler.h"
+
+#include "base/android/jni_android.h"
+#include "base/android/jni_string.h"
+#include "base/logging.h"
+#include "content/public/browser/trace_controller.h"
+#include "jni/TracingIntentHandler_jni.h"
+
+namespace content {
+
+TracingIntentHandler* g_trace_intent_handler = NULL;
+
+TracingIntentHandler::TracingIntentHandler(const FilePath& path)
+    : TraceSubscriberStdio(path) {
+  TraceController::GetInstance()->BeginTracing(this, std::string("-test*"));
+}
+
+TracingIntentHandler::~TracingIntentHandler() {
+}
+
+void TracingIntentHandler::OnEndTracingComplete() {
+  TraceSubscriberStdio::OnEndTracingComplete();
+  delete this;
+}
+
+void TracingIntentHandler::OnEndTracing() {
+  if (!TraceController::GetInstance()->EndTracingAsync(this)) {
+    delete this;
+  }
+}
+
+static void BeginTracing(JNIEnv* env, jclass clazz, jstring jspath) {
+  std::string path(base::android::ConvertJavaStringToUTF8(env, jspath));
+  if (g_trace_intent_handler != NULL)
+    return;
+  g_trace_intent_handler = new TracingIntentHandler(FilePath(path));
+}
+
+static void EndTracing(JNIEnv* env, jclass clazz) {
+  DCHECK(!g_trace_intent_handler);
+  g_trace_intent_handler->OnEndTracing();
+  g_trace_intent_handler = NULL;
+}
+
+bool RegisterTracingIntentHandler(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+}  // namespace content