[tracing] Add browser test for background memory tracing

chrome/test/base/tracing.h

 // Copyright (c) 2011 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.
 
 #ifndef CHROME_TEST_BASE_TRACING_H_
 #define CHROME_TEST_BASE_TRACING_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/time/time.h"
+#include "base/trace_event/trace_config.h"
 
 namespace tracing {
 
 // Called from UI thread.
 // Begin tracing specified category_patterns on the browser.
 // |category_patterns| is a comma-delimited list of category wildcards.
 // A category pattern can have an optional '-' prefix to make  categories with
 // matching categorys excluded. Either all category_patterns must be included
 // or all must be excluded.
 //
 // Example: BeginTracing("test_MyTest*");
 // Example: BeginTracing("test_MyTest*,test_OtherStuff");
 // Example: BeginTracing("-excluded_category1,-excluded_category2");
 //
 // See base/trace_event/trace_event.h for documentation of included and excluded
 // category_patterns.
 bool BeginTracing(const std::string& category_patterns) WARN_UNUSED_RESULT;
 
 // Called from UI thread.
 // Specify a watch event in order to use the WaitForWatchEvent function.
 // After |num_occurrences| of the given event have been seen on a particular
 // process, WaitForWatchEvent will return.
 bool BeginTracingWithWatch(const std::string& category_patterns,
                            const std::string& category_name,
                            const std::string& event_name,
                            int num_occurrences) WARN_UNUSED_RESULT;
 
 // Called from UI thread.
+// Begin tracing specified category_patterns on the browser.
+// |trace_config| specifies the configuration for tracing. This includes the
+// list of categories enabled, tracing modes and memory dumps configuration.
+//
+// See base/trace_event/trace_config.h for documentation of configurations.
+bool BeginTracingWithTraceConfig(
+    const base::trace_event::TraceConfig& trace_config) WARN_UNUSED_RESULT;
+
+// Called from UI thread.
 // Wait on the event set with BeginTracingWithWatch. If non-zero, return after
 // |timeout| regardless of watch event notification. Returns true if watch event
 // occurred, false if it timed out.
 bool WaitForWatchEvent(base::TimeDelta timeout) WARN_UNUSED_RESULT;
 
 // Called from UI thread.
 // End trace and collect the trace output as a json string.
 bool EndTracing(std::string* json_trace_output) WARN_UNUSED_RESULT;
 
 }  // namespace tracing
 
 #endif  // CHROME_TEST_BASE_TRACING_H_