[UMA] Use proper C++ objects to serialize tracked_objects across process boundaries.

chrome/browser/task_profiler/task_profiler_data_serializer_unittest.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 <string>
+
+#include "base/basictypes.h"
+#include "base/json/json_writer.h"
+#include "base/process_util.h"
+#include "base/string_number_conversions.h"
+#include "base/tracked_objects.h"
+#include "base/values.h"
+#include "chrome/browser/task_profiler/task_profiler_data_serializer.h"
+#include "content/public/common/process_type.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+std::string GetProcessIdString() {
+  return base::IntToString(base::GetCurrentProcId());
+}
+
+void ExpectSerialization(
+    const tracked_objects::ProcessDataSnapshot& process_data,
+    content::ProcessType process_type,
+    const std::string& expected_json) {
+  base::DictionaryValue serialized_value;
+  task_profiler::TaskProfilerDataSerializer::ToValue(
+      process_data, process_type, &serialized_value);
+
+  std::string serialized_json;
+  base::JSONWriter::Write(&serialized_value, &serialized_json);
+
+  EXPECT_EQ(expected_json, serialized_json);
+}
+
+}  // anonymous namespace
+
+// Tests the JSON serialization format for profiled process data.
+TEST(TaskProfilerDataSerializerTest, SerializeProcessDataToJson) {
+  {
+    // Empty data.
+    tracked_objects::ProcessDataSnapshot process_data;
+    content::ProcessType process_type = content::PROCESS_TYPE_BROWSER;
+    ExpectSerialization(process_data, process_type,
+                        "{"
+                          "\"descendants\":["
+                          "],"
+                          "\"list\":["
+                          "],"
+                          "\"process_id\":" + GetProcessIdString() + ","
+                          "\"process_type\":\"Browser\""
+                        "}");
+  }
+
+  {
+    // Non-empty data.
+    tracked_objects::ProcessDataSnapshot process_data;
+
+    tracked_objects::BirthOnThreadSnapshot parent;
+    parent.location.file_name = "path/to/foo.cc";
+    parent.location.function_name = "WhizBang";
+    parent.location.line_number = 101;
+    parent.thread_name = "CrBrowserMain";
+
+    tracked_objects::BirthOnThreadSnapshot child;
+    child.location.file_name = "path/to/bar.cc";
+    child.location.function_name = "FizzBoom";
+    child.location.line_number = 433;
+    child.thread_name = "Chrome_IOThread";
+
+
+    // Add a snapshot.
+    process_data.tasks.push_back(tracked_objects::TaskSnapshot());
+    process_data.tasks.back().birth = parent;
+    process_data.tasks.back().death_data.count = 37;
+    process_data.tasks.back().death_data.run_duration_max = 5;
+    process_data.tasks.back().death_data.run_duration_sample = 3;
+    process_data.tasks.back().death_data.run_duration_sum = 17;
+    process_data.tasks.back().death_data.queue_duration_max = 53;
+    process_data.tasks.back().death_data.queue_duration_sample = 13;
+    process_data.tasks.back().death_data.queue_duration_sum = 79;
+    process_data.tasks.back().death_thread_name = "WorkerPool/-1340960768";
+
+    // Add a second snapshot.
+    process_data.tasks.push_back(tracked_objects::TaskSnapshot());
+    process_data.tasks.back().birth = child;
+    process_data.tasks.back().death_data.count = 41;
+    process_data.tasks.back().death_data.run_duration_max = 205;
+    process_data.tasks.back().death_data.run_duration_sample = 203;
+    process_data.tasks.back().death_data.run_duration_sum = 2017;
+    process_data.tasks.back().death_data.queue_duration_max = 2053;
+    process_data.tasks.back().death_data.queue_duration_sample = 2013;
+    process_data.tasks.back().death_data.queue_duration_sum = 2079;
+    process_data.tasks.back().death_thread_name = "PAC thread #3";
+
+    // Add a parent-child pair.
+    process_data.descendants.push_back(
+        tracked_objects::ParentChildPairSnapshot());
+    process_data.descendants.back().parent = parent;
+    process_data.descendants.back().child = child;
+
+    content::ProcessType process_type = content::PROCESS_TYPE_RENDERER;
+    ExpectSerialization(process_data, process_type,
+                       "{"
+                          "\"descendants\":["
+                             "{"
+                               "\"child_location\":{"
+                                  "\"file_name\":\"path/to/bar.cc\","
+                                  "\"function_name\":\"FizzBoom\","
+                                 "\"line_number\":433"
+                               "},"
+                               "\"child_thread\":\"Chrome_IOThread\","
+                               "\"parent_location\":{"
+                                  "\"file_name\":\"path/to/foo.cc\","
+                                  "\"function_name\":\"WhizBang\","
+                                  "\"line_number\":101"
+                               "},"
+                               "\"parent_thread\":\"CrBrowserMain\""
+                             "}"
+                          "],"
+                          "\"list\":[{"
+                             "\"birth_location\":{"
+                                "\"file_name\":\"path/to/foo.cc\","
+                                "\"function_name\":\"WhizBang\","
+                                "\"line_number\":101"
+                             "},"
+                             "\"birth_thread\":\"CrBrowserMain\","
+                             "\"death_data\":{"
+                                "\"count\":37,"
+                                "\"queue_ms\":79,"
+                                "\"queue_ms_max\":53,"
+                                "\"queue_ms_sample\":13,"
+                                "\"run_ms\":17,"
+                                "\"run_ms_max\":5,"
+                                "\"run_ms_sample\":3"
+                             "},"
+                             "\"death_thread\":\"WorkerPool/-1340960768\""
+                          "},{"
+                             "\"birth_location\":{"
+                                "\"file_name\":\"path/to/bar.cc\","
+                                "\"function_name\":\"FizzBoom\","
+                                "\"line_number\":433"
+                             "},"
+                             "\"birth_thread\":\"Chrome_IOThread\","
+                             "\"death_data\":{"
+                                "\"count\":41,"
+                                "\"queue_ms\":2079,"
+                                "\"queue_ms_max\":2053,"
+                                "\"queue_ms_sample\":2013,"
+                                "\"run_ms\":2017,"
+                                "\"run_ms_max\":205,"
+                                "\"run_ms_sample\":203"
+                             "},"
+                             "\"death_thread\":\"PAC thread #3\""
+                          "}],"
+                          "\"process_id\":" + GetProcessIdString() + ","
+                          "\"process_type\":\"Tab\""
+                        "}");
+  }
+}