[tracing] Add browser test for background memory tracing

chrome/test/base/tracing.cc

 // 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 "chrome/test/base/tracing.h"
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/macros.h"
 #include "base/memory/singleton.h"
@@ skipping 37 matching lines @@
  public:
   static InProcessTraceController* GetInstance() {
     return base::Singleton<InProcessTraceController>::get();
   }
 
   InProcessTraceController()
       : is_waiting_on_watch_(false),
         watch_notification_count_(0) {}
   virtual ~InProcessTraceController() {}
 
-  bool BeginTracing(const std::string& category_patterns) {
+  bool BeginTracing(const base::trace_event::TraceConfig& trace_config) {
     DCHECK_CURRENTLY_ON(BrowserThread::UI);
     return content::TracingController::GetInstance()->StartTracing(
-        base::trace_event::TraceConfig(category_patterns, ""),
-        content::TracingController::StartTracingDoneCallback());
+        trace_config, content::TracingController::StartTracingDoneCallback());
   }
 
   bool BeginTracingWithWatch(const std::string& category_patterns,
                              const std::string& category_name,
                              const std::string& event_name,
                              int num_occurrences) {
     DCHECK_CURRENTLY_ON(BrowserThread::UI);
     DCHECK(num_occurrences > 0);
     watch_notification_count_ = num_occurrences;
     if (!content::TracingController::GetInstance()->SetWatchEvent(
@@ skipping 86 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(InProcessTraceController);
 };
 
 }  // namespace
 
 namespace tracing {
 
 bool BeginTracing(const std::string& category_patterns) {
   return InProcessTraceController::GetInstance()->BeginTracing(
-      category_patterns);
+      base::trace_event::TraceConfig(category_patterns, ""));
 }
 
 bool BeginTracingWithWatch(const std::string& category_patterns,
                            const std::string& category_name,
                            const std::string& event_name,
                            int num_occurrences) {
   return InProcessTraceController::GetInstance()->BeginTracingWithWatch(
       category_patterns, category_name, event_name, num_occurrences);
 }
 
+bool BeginTracingWithTraceConfig(
+    const base::trace_event::TraceConfig& trace_config) {
+  return InProcessTraceController::GetInstance()->BeginTracing(trace_config);
+}
+
 bool WaitForWatchEvent(base::TimeDelta timeout) {
   return InProcessTraceController::GetInstance()->WaitForWatchEvent(timeout);
 }
 
 bool EndTracing(std::string* json_trace_output) {
   return InProcessTraceController::GetInstance()->EndTracing(json_trace_output);
 }
 
 }  // namespace tracing