[tracing] Add test for memory-infra startup tracing

content/browser/tracing/memory_tracing_browsertest.cc

 // Copyright 2015 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 "base/bind.h"
 #include "base/command_line.h"
 #include "base/run_loop.h"
 #include "base/thread_task_runner_handle.h"
 #include "base/trace_event/memory_dump_manager.h"
 #include "base/trace_event/memory_dump_provider.h"
 #include "base/trace_event/memory_dump_request_args.h"
+#include "base/trace_event/trace_config_memory_test_util.h"
 #include "content/public/browser/tracing_controller.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/test/browser_test_utils.h"
 #include "content/public/test/content_browser_test.h"
 #include "content/public/test/content_browser_test_utils.h"
 #include "content/shell/browser/shell.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 using base::trace_event::MemoryDumpArgs;
 using base::trace_event::MemoryDumpManager;
@@ skipping 40 matching lines @@
     last_callback_success_ = success;
     closure.Run();
   }
 
  protected:
   void SetUp() override {
     callback_call_count_ = 0;
     last_callback_dump_guid_ = 0;
     last_callback_success_ = false;
 
-    // TODO(primiano): This should be done via TraceConfig.
-    // See https://goo.gl/5Hj3o0.
-    MemoryDumpManager::GetInstance()->DisablePeriodicDumpsForTesting();
-
     mock_dump_provider_.reset(new MockDumpProvider());
     MemoryDumpManager::GetInstance()->RegisterDumpProvider(
         mock_dump_provider_.get());
     ContentBrowserTest::SetUp();
   }
 
   void TearDown() override {
     MemoryDumpManager::GetInstance()->UnregisterDumpProvider(
         mock_dump_provider_.get());
     mock_dump_provider_.reset();
     ContentBrowserTest::TearDown();
   }
 
   void EnableMemoryTracing() {
+    // Enable tracing without periodic dumps.
+    base::trace_event::TraceConfig trace_config(
+        base::trace_event::TraceConfigMemoryTestUtil::
+            GetTraceConfig_EmptyTriggers());
+
     base::RunLoop run_loop;
-    std::string category_filter = MemoryDumpManager::kTraceCategory;
-    base::trace_event::TraceConfig trace_config(category_filter, "");
     bool success = TracingController::GetInstance()->EnableRecording(
       trace_config, run_loop.QuitClosure());
     EXPECT_TRUE(success);
     run_loop.Run();
   }
 
   void DisableTracing() {
     bool success = TracingController::GetInstance()->DisableRecording(NULL);
     EXPECT_TRUE(success);
     base::RunLoop().RunUntilIdle();
@@ skipping 110 matching lines @@
 
   EnableMemoryTracing();
   RequestGlobalDumpAndWait(false /* from_renderer_thread */);
   EXPECT_EQ(1u, callback_call_count_);
   EXPECT_NE(0u, last_callback_dump_guid_);
   EXPECT_TRUE(last_callback_success_);
   DisableTracing();
 }
 
 }  // namespace content