Add process lifetime annotations to stack samples.

components/metrics/call_stack_profile_metrics_provider_unittest.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 "components/metrics/call_stack_profile_metrics_provider.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <utility>
 
 #include "base/macros.h"
 #include "base/metrics/field_trial.h"
 #include "base/profiler/stack_sampling_profiler.h"
 #include "base/run_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "build/build_config.h"
 #include "components/metrics/call_stack_profile_params.h"
 #include "components/metrics/proto/chrome_user_metrics_extension.pb.h"
 #include "components/variations/entropy_provider.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using base::StackSamplingProfiler;
 using Frame = StackSamplingProfiler::Frame;
 using Module = StackSamplingProfiler::Module;
 using Profile = StackSamplingProfiler::CallStackProfile;
 using Profiles = StackSamplingProfiler::CallStackProfiles;
 using Sample = StackSamplingProfiler::Sample;
 
+namespace {
+
+struct ExpectedProtoModule {
+  const char* build_id;
+  uint64_t name_md5;
+  uint64_t base_address;
+};
+
+struct ExpectedProtoEntry {
+  int32_t module_index;
+  uint64_t address;
+};
+
+struct ExpectedProtoSample {
+  uint32_t process_phases;  // Bit-field of expected phases.
+  const ExpectedProtoEntry* entries;
+  int entry_count;
+  int64_t entry_repeats;
+};
+
+struct ExpectedProtoProfile {
+  int32_t duration_ms;
+  int32_t period_ms;
+  const ExpectedProtoModule* modules;
+  int module_count;
+  const ExpectedProtoSample* samples;
+  int sample_count;
+};
+
+class ProfilesGenerator {
+ public:
+  using Generator = uintptr_t;

[Mike Wittman, 2016/11/23 00:28:40]

This and the following enum can be made private.

[bcwhite, 2016/11/23 14:45:53]

Done.

+
+  enum : Generator {
+    kEndOfGenerator,
+    kAddPhase,
+    kNewProfile,
+    kNewSample,
+    kAddFrame,
+    kDefineModule,
+  };
+
+  ProfilesGenerator(){};
+  ~ProfilesGenerator(){};
+
+  ProfilesGenerator& AddPhase(int phase) {
+    generator_.push_back(kAddPhase);
+    generator_.push_back(static_cast<Generator>(phase));
+    return *this;
+  }
+  ProfilesGenerator& NewProfile(int duration_ms, int interval_ms) {
+    generator_.push_back(kNewProfile);
+    generator_.push_back(static_cast<Generator>(duration_ms));
+    generator_.push_back(static_cast<Generator>(interval_ms));
+    return *this;
+  }
+  ProfilesGenerator& NewSample() {
+    generator_.push_back(kNewSample);
+    return *this;
+  }
+  ProfilesGenerator& AddFrame(size_t module, uintptr_t offset) {
+    generator_.push_back(kAddFrame);
+    generator_.push_back(static_cast<Generator>(module));
+    generator_.push_back(static_cast<Generator>(offset));
+    return *this;
+  }
+  ProfilesGenerator& DefineModule(const char* name,
+                                  const base::FilePath& path,
+                                  uintptr_t base) {
+    generator_.push_back(kDefineModule);
+    generator_.push_back(reinterpret_cast<Generator>(name));
+    generator_.push_back(reinterpret_cast<Generator>(&path));
+    generator_.push_back(static_cast<Generator>(base));
+    return *this;
+  }
+  ProfilesGenerator& End() {

[Mike Wittman, 2016/11/23 00:28:40]

I think this function can be removed (based on comment below).

[bcwhite, 2016/11/23 14:45:53]

Done.

+    generator_.push_back(kEndOfGenerator);
+    return *this;
+  }
+
+  void GenerateProfiles(Profiles* profiles);

[Mike Wittman, 2016/11/23 00:28:40]

If we change this to
Profiles Build() const;

then the callers can be simplified:
Profiles profiles = ProfilesGenerator()
    .NewProfile(100, 10)
    /* ... */
    .Build();

This should be the same cost due to RVO.

[bcwhite, 2016/11/23 14:45:53]

I like it!

Except...  oh.  <sigh>  I guess I should do away with the generator_ vector
completely and just build an internal Profiles object on the fly.

[Mike Wittman, 2016/11/23 16:50:54]

Nice, this is much cleaner.

+
+ private:
+  std::vector<uintptr_t> generator_;
+
+  DISALLOW_COPY_AND_ASSIGN(ProfilesGenerator);
+};
+
+void ProfilesGenerator::GenerateProfiles(Profiles* profiles) {
+  uint32_t process_phases = 0;
+  Profile* profile = nullptr;
+
+  const ProfilesGenerator::Generator* generator = &generator_[0];
+  while (true) {

[Mike Wittman, 2016/11/23 00:28:40]

We should be able to eliminate kEndOfGenerator now, since we know the size of
the array in this function.

[bcwhite, 2016/11/23 14:45:53]

Done.

+    switch (*generator++) {
+      case kEndOfGenerator:
+        return;
+      case kAddPhase:
+        process_phases |= 1 << *generator++;
+        break;
+      case kNewProfile:
+        profiles->push_back(Profile());
+        profile = &profiles->back();
+        profile->profile_duration =
+            base::TimeDelta::FromMilliseconds(*generator++);
+        profile->sampling_period =
+            base::TimeDelta::FromMilliseconds(*generator++);
+        break;
+      case kNewSample:
+        profile->samples.push_back(Sample());
+        profile->samples.back().process_phases = process_phases;
+        break;
+      case kAddFrame: {
+        size_t index = static_cast<size_t>(*generator++);
+        uintptr_t address = static_cast<uintptr_t>(*generator++);
+        profile->samples.back().frames.push_back(Frame(address, index));
+      } break;
+      case kDefineModule: {
+        const char* name =
+            reinterpret_cast<const char*>(static_cast<uintptr_t>(*generator++));
+        const base::FilePath* path = reinterpret_cast<const base::FilePath*>(
+            static_cast<uintptr_t>(*generator++));
+        uintptr_t base = static_cast<uintptr_t>(*generator++);
+        profile->modules.push_back(Module(base, name, *path));
+      } break;
+      default:
+        NOTREACHED();
+    };
+  }
+}
+
+}  // namespace
+
 namespace metrics {
 
 // This test fixture enables the field trial that
 // CallStackProfileMetricsProvider depends on to report profiles.
 class CallStackProfileMetricsProviderTest : public testing::Test {
  public:
   CallStackProfileMetricsProviderTest()
       : field_trial_list_(nullptr) {
     base::FieldTrialList::CreateFieldTrial(
         TestState::kFieldTrialName,
         TestState::kReportProfilesGroupName);
     TestState::ResetStaticStateForTesting();
   }
 
   ~CallStackProfileMetricsProviderTest() override {}
 
   // Utility function to append profiles to the metrics provider.
   void AppendProfiles(const CallStackProfileParams& params, Profiles profiles) {
     CallStackProfileMetricsProvider::GetProfilerCallback(params).Run(
         std::move(profiles));
   }
 
+  void VerifyProfileProto(const ExpectedProtoProfile& expected,
+                          const SampledProfile& proto);
+
  private:
   // Exposes field trial/group names from the CallStackProfileMetricsProvider.
   class TestState : public CallStackProfileMetricsProvider {
    public:
     using CallStackProfileMetricsProvider::kFieldTrialName;
     using CallStackProfileMetricsProvider::kReportProfilesGroupName;
     using CallStackProfileMetricsProvider::ResetStaticStateForTesting;
   };
 
   base::FieldTrialList field_trial_list_;
 
   DISALLOW_COPY_AND_ASSIGN(CallStackProfileMetricsProviderTest);
 };
 
+void CallStackProfileMetricsProviderTest::VerifyProfileProto(
+    const ExpectedProtoProfile& expected,
+    const SampledProfile& proto) {
+  ASSERT_TRUE(proto.has_call_stack_profile());
+  const CallStackProfile& stack = proto.call_stack_profile();
+
+  ASSERT_TRUE(stack.has_profile_duration_ms());
+  EXPECT_EQ(expected.duration_ms, stack.profile_duration_ms());
+  ASSERT_TRUE(stack.has_sampling_period_ms());
+  EXPECT_EQ(expected.period_ms, stack.sampling_period_ms());
+
+  ASSERT_EQ(expected.module_count, stack.module_id().size());
+  for (int m = 0; m < expected.module_count; ++m) {
+    SCOPED_TRACE("module " + base::IntToString(m));
+    const CallStackProfile::ModuleIdentifier& module_id =
+        stack.module_id().Get(m);
+    ASSERT_TRUE(module_id.has_build_id());
+    EXPECT_EQ(expected.modules[m].build_id, module_id.build_id());
+    ASSERT_TRUE(module_id.has_name_md5_prefix());
+    EXPECT_EQ(expected.modules[m].name_md5, module_id.name_md5_prefix());
+  }
+
+  ASSERT_EQ(expected.sample_count, stack.sample().size());
+  for (int s = 0; s < expected.sample_count; ++s) {
+    SCOPED_TRACE("sample " + base::IntToString(s));
+    const CallStackProfile::Sample& proto_sample = stack.sample().Get(s);
+
+    uint32_t process_phases = 0;
+    for (int i = 0; i < proto_sample.process_phase().size(); ++i)
+      process_phases |= 1U << proto_sample.process_phase().Get(i);
+    EXPECT_EQ(expected.samples[s].process_phases, process_phases);
+
+    ASSERT_EQ(expected.samples[s].entry_count, proto_sample.entry().size());
+    ASSERT_TRUE(proto_sample.has_count());
+    EXPECT_EQ(expected.samples[s].entry_repeats, proto_sample.count());
+    for (int e = 0; e < expected.samples[s].entry_count; ++e) {
+      SCOPED_TRACE("entry " + base::SizeTToString(e));
+      const CallStackProfile::Entry& entry = proto_sample.entry().Get(e);
+      if (expected.samples[s].entries[e].module_index >= 0) {
+        ASSERT_TRUE(entry.has_module_id_index());
+        EXPECT_EQ(expected.samples[s].entries[e].module_index,
+                  entry.module_id_index());
+        ASSERT_TRUE(entry.has_address());
+        EXPECT_EQ(expected.samples[s].entries[e].address, entry.address());
+      } else {
+        EXPECT_FALSE(entry.has_module_id_index());
+        EXPECT_FALSE(entry.has_address());
+      }
+    }
+  }
+}
+
 // Checks that all properties from multiple profiles are filled as expected.
 TEST_F(CallStackProfileMetricsProviderTest, MultipleProfiles) {
-  const uintptr_t module1_base_address = 0x1000;
-  const uintptr_t module2_base_address = 0x2000;
-  const uintptr_t module3_base_address = 0x3000;
-
-  const Module profile_modules[][2] = {
-    {
-      Module(
-          module1_base_address,
-          "ABCD",
-#if defined(OS_WIN)
-          base::FilePath(L"c:\\some\\path\\to\\chrome.exe")
-#else
-          base::FilePath("/some/path/to/chrome")
-#endif
-      ),
-      Module(
-          module2_base_address,
-          "EFGH",
-#if defined(OS_WIN)
-          base::FilePath(L"c:\\some\\path\\to\\third_party.dll")
-#else
-          base::FilePath("/some/path/to/third_party.so")
-#endif
-      ),
-    },
-    {
-      Module(
-          module3_base_address,
-          "MNOP",
-#if defined(OS_WIN)
-          base::FilePath(L"c:\\some\\path\\to\\third_party2.dll")
-#else
-          base::FilePath("/some/path/to/third_party2.so")
-#endif
-      ),
-      Module( // Repeated from the first profile.
-          module1_base_address,
-          "ABCD",
-#if defined(OS_WIN)
-          base::FilePath(L"c:\\some\\path\\to\\chrome.exe")
-#else
-          base::FilePath("/some/path/to/chrome")
-#endif
-      )
-    }
-  };
+  const uintptr_t moduleA_base_address = 0x1000;
+  const uintptr_t moduleB_base_address = 0x2000;
+  const uintptr_t moduleC_base_address = 0x3000;
+  const char* moduleA_name = "ABCD";
+  const char* moduleB_name = "EFGH";
+  const char* moduleC_name = "MNOP";
 
   // Values for Windows generated with:
   // perl -MDigest::MD5=md5 -MEncode=encode
   //     -e 'for(@ARGV){printf "%x\n", unpack "Q>", md5 encode "UTF-16LE", $_}'
   //     chrome.exe third_party.dll third_party2.dll
   //
   // Values for Linux generated with:
   // perl -MDigest::MD5=md5
   //     -e 'for(@ARGV){printf "%x\n", unpack "Q>", md5 $_}'
   //     chrome third_party.so third_party2.so
-  const uint64_t profile_expected_name_md5_prefixes[][2] = {
-      {
 #if defined(OS_WIN)
-          0x46c3e4166659ac02ULL, 0x7e2b8bfddeae1abaULL
+  uint64_t moduleA_md5 = 0x46C3E4166659AC02ULL;
+  uint64_t moduleB_md5 = 0x7E2B8BFDDEAE1ABAULL;
+  uint64_t moduleC_md5 = 0x87B66F4573A4D5CAULL;
+  base::FilePath moduleA_path(L"c:\\some\\path\\to\\chrome.exe");
+  base::FilePath moduleB_path(L"c:\\some\\path\\to\\third_party.dll");
+  base::FilePath moduleC_path(L"c:\\some\\path\\to\\third_party2.dll");
 #else
-          0x554838a8451ac36cUL, 0x843661148659c9f8UL
+  uint64_t moduleA_md5 = 0x554838A8451AC36CULL;
+  uint64_t moduleB_md5 = 0x843661148659C9F8ULL;
+  uint64_t moduleC_md5 = 0xB4647E539FA6EC9EULL;
+  base::FilePath moduleA_path("/some/path/to/chrome");
+  base::FilePath moduleB_path("/some/path/to/third_party.so");
+  base::FilePath moduleC_path("/some/path/to/third_party2.so");
 #endif
-      },
-      {
-#if defined(OS_WIN)
-          0x87b66f4573a4d5caULL, 0x46c3e4166659ac02ULL
-#else
-          0xb4647e539fa6ec9eUL, 0x554838a8451ac36cUL
-#endif
-      }};
 
   // Represents two stack samples for each of two profiles, where each stack
   // contains three frames. Each frame contains an instruction pointer and a
   // module index corresponding to the module for the profile in
   // profile_modules.
   //
   // So, the first stack sample below has its top frame in module 0 at an offset
   // of 0x10 from the module's base address, the next-to-top frame in module 1
   // at an offset of 0x20 from the module's base address, and the bottom frame
   // in module 0 at an offset of 0x30 from the module's base address
-  const Frame profile_sample_frames[][2][3] = {
-    {
+  ProfilesGenerator test_profiles_generator;
+  test_profiles_generator
+      .NewProfile(100, 10)
+      .DefineModule(moduleA_name, moduleA_path, moduleA_base_address)
+      .DefineModule(moduleB_name, moduleB_path, moduleB_base_address)
+
+      .NewSample()
+      .AddFrame(0, moduleA_base_address + 0x10)
+      .AddFrame(1, moduleB_base_address + 0x20)
+      .AddFrame(0, moduleA_base_address + 0x30)
+      .NewSample()
+      .AddFrame(1, moduleB_base_address + 0x10)
+      .AddFrame(0, moduleA_base_address + 0x20)
+      .AddFrame(1, moduleB_base_address + 0x30)
+
+      .NewProfile(200, 20)
+      .DefineModule(moduleC_name, moduleC_path, moduleC_base_address)
+      .DefineModule(moduleA_name, moduleA_path, moduleA_base_address)
+
+      .NewSample()
+      .AddFrame(0, moduleC_base_address + 0x10)
+      .AddFrame(1, moduleA_base_address + 0x20)
+      .AddFrame(0, moduleC_base_address + 0x30)
+      .NewSample()
+      .AddFrame(1, moduleA_base_address + 0x10)
+      .AddFrame(0, moduleC_base_address + 0x20)
+      .AddFrame(1, moduleA_base_address + 0x30)
+
+      .End();
+
+  const ExpectedProtoModule expected_proto_modules1[] = {
+      { moduleA_name, moduleA_md5, moduleA_base_address },
+      { moduleB_name, moduleB_md5, moduleB_base_address }
+  };
+
+  const ExpectedProtoEntry expected_proto_entries11[] = {
+      { 0, 0x10 },
+      { 1, 0x20 },
+      { 0, 0x30 },
+  };
+  const ExpectedProtoEntry expected_proto_entries12[] = {
+      { 1, 0x10 },
+      { 0, 0x20 },
+      { 1, 0x30 },
+  };
+  const ExpectedProtoSample expected_proto_samples1[] = {
       {
-        Frame(module1_base_address + 0x10, 0),
-        Frame(module2_base_address + 0x20, 1),
-        Frame(module1_base_address + 0x30, 0)
+          0, expected_proto_entries11, arraysize(expected_proto_entries11), 1,
       },
       {
-        Frame(module2_base_address + 0x10, 1),
-        Frame(module1_base_address + 0x20, 0),
-        Frame(module2_base_address + 0x30, 1)
-      }
-    },
-    {
+          0, expected_proto_entries12, arraysize(expected_proto_entries12), 1,
+      },
+  };
+
+  const ExpectedProtoModule expected_proto_modules2[] = {
+      { moduleC_name, moduleC_md5, moduleC_base_address },
+      { moduleA_name, moduleA_md5, moduleA_base_address }
+  };
+
+  const ExpectedProtoEntry expected_proto_entries21[] = {
+      { 0, 0x10 },
+      { 1, 0x20 },
+      { 0, 0x30 },
+  };
+  const ExpectedProtoEntry expected_proto_entries22[] = {
+      { 1, 0x10 },
+      { 0, 0x20 },
+      { 1, 0x30 },
+  };
+  const ExpectedProtoSample expected_proto_samples2[] = {
       {
-        Frame(module3_base_address + 0x10, 0),
-        Frame(module1_base_address + 0x20, 1),
-        Frame(module3_base_address + 0x30, 0)
+          0, expected_proto_entries11, arraysize(expected_proto_entries21), 1,
       },
       {
-        Frame(module1_base_address + 0x10, 1),
-        Frame(module3_base_address + 0x20, 0),
-        Frame(module1_base_address + 0x30, 1)
-      }
-    }
+          0, expected_proto_entries12, arraysize(expected_proto_entries22), 1,
+      },
   };
 
-  base::TimeDelta profile_durations[2] = {
-    base::TimeDelta::FromMilliseconds(100),
-    base::TimeDelta::FromMilliseconds(200)
+  const ExpectedProtoProfile expected_proto_profiles[] = {
+      {
+          100, 10,
+          expected_proto_modules1, arraysize(expected_proto_modules1),
+          expected_proto_samples1, arraysize(expected_proto_samples1),
+      },
+      {
+          200, 20,
+          expected_proto_modules2, arraysize(expected_proto_modules2),
+          expected_proto_samples2, arraysize(expected_proto_samples2),
+      },
   };
 
-  base::TimeDelta profile_sampling_periods[2] = {
-    base::TimeDelta::FromMilliseconds(10),
-    base::TimeDelta::FromMilliseconds(20)
-  };
-
-  std::vector<Profile> profiles;
-  for (size_t i = 0; i < arraysize(profile_sample_frames); ++i) {
-    Profile profile;
-    profile.modules.insert(
-        profile.modules.end(), &profile_modules[i][0],
-        &profile_modules[i][0] + arraysize(profile_modules[i]));
-
-    for (size_t j = 0; j < arraysize(profile_sample_frames[i]); ++j) {
-      profile.samples.push_back(Sample());
-      Sample& sample = profile.samples.back();
-      sample.insert(sample.end(), &profile_sample_frames[i][j][0],
-                    &profile_sample_frames[i][j][0] +
-                    arraysize(profile_sample_frames[i][j]));
-    }
-
-    profile.profile_duration = profile_durations[i];
-    profile.sampling_period = profile_sampling_periods[i];
-
-    profiles.push_back(std::move(profile));
-  }
+  Profiles profiles;
+  test_profiles_generator.GenerateProfiles(&profiles);
+  ASSERT_EQ(arraysize(expected_proto_profiles), profiles.size());
 
   CallStackProfileMetricsProvider provider;
   provider.OnRecordingEnabled();
   AppendProfiles(
       CallStackProfileParams(CallStackProfileParams::BROWSER_PROCESS,
                              CallStackProfileParams::UI_THREAD,
                              CallStackProfileParams::PROCESS_STARTUP,
                              CallStackProfileParams::MAY_SHUFFLE),
       std::move(profiles));
   ChromeUserMetricsExtension uma_proto;
   provider.ProvideGeneralMetrics(&uma_proto);
 
-  ASSERT_EQ(static_cast<int>(arraysize(profile_sample_frames)),
+  ASSERT_EQ(static_cast<int>(arraysize(expected_proto_profiles)),
             uma_proto.sampled_profile().size());
-  for (size_t i = 0; i < arraysize(profile_sample_frames); ++i) {
-    SCOPED_TRACE("profile " + base::SizeTToString(i));
-    const SampledProfile& sampled_profile = uma_proto.sampled_profile().Get(i);
-    ASSERT_TRUE(sampled_profile.has_call_stack_profile());
-    const CallStackProfile& call_stack_profile =
-        sampled_profile.call_stack_profile();
-
-    ASSERT_EQ(static_cast<int>(arraysize(profile_sample_frames[i])),
-              call_stack_profile.sample().size());
-    for (size_t j = 0; j < arraysize(profile_sample_frames[i]); ++j) {
-      SCOPED_TRACE("sample " + base::SizeTToString(j));
-      const CallStackProfile::Sample& proto_sample =
-          call_stack_profile.sample().Get(j);
-      ASSERT_EQ(static_cast<int>(arraysize(profile_sample_frames[i][j])),
-                proto_sample.entry().size());
-      ASSERT_TRUE(proto_sample.has_count());
-      EXPECT_EQ(1u, proto_sample.count());
-      for (size_t k = 0; k < arraysize(profile_sample_frames[i][j]); ++k) {
-        SCOPED_TRACE("frame " + base::SizeTToString(k));
-        const CallStackProfile::Entry& entry = proto_sample.entry().Get(k);
-        ASSERT_TRUE(entry.has_address());
-        const char* instruction_pointer = reinterpret_cast<const char*>(
-            profile_sample_frames[i][j][k].instruction_pointer);
-        const char* module_base_address = reinterpret_cast<const char*>(
-            profile_modules[i][profile_sample_frames[i][j][k].module_index]
-            .base_address);
-        EXPECT_EQ(
-            static_cast<uint64_t>(instruction_pointer - module_base_address),
-            entry.address());
-        ASSERT_TRUE(entry.has_module_id_index());
-        EXPECT_EQ(profile_sample_frames[i][j][k].module_index,
-                  static_cast<size_t>(entry.module_id_index()));
-      }
-    }
-
-    ASSERT_EQ(static_cast<int>(arraysize(profile_modules[i])),
-              call_stack_profile.module_id().size());
-    for (size_t j = 0; j < arraysize(profile_modules[i]); ++j) {
-      SCOPED_TRACE("module " + base::SizeTToString(j));
-      const CallStackProfile::ModuleIdentifier& module_identifier =
-          call_stack_profile.module_id().Get(j);
-      ASSERT_TRUE(module_identifier.has_build_id());
-      EXPECT_EQ(profile_modules[i][j].id, module_identifier.build_id());
-      ASSERT_TRUE(module_identifier.has_name_md5_prefix());
-      EXPECT_EQ(profile_expected_name_md5_prefixes[i][j],
-                module_identifier.name_md5_prefix());
-    }
-
-    ASSERT_TRUE(call_stack_profile.has_profile_duration_ms());
-    EXPECT_EQ(profile_durations[i].InMilliseconds(),
-              call_stack_profile.profile_duration_ms());
-    ASSERT_TRUE(call_stack_profile.has_sampling_period_ms());
-    EXPECT_EQ(profile_sampling_periods[i].InMilliseconds(),
-              call_stack_profile.sampling_period_ms());
-    ASSERT_TRUE(sampled_profile.has_process());
-    EXPECT_EQ(BROWSER_PROCESS, sampled_profile.process());
-    ASSERT_TRUE(sampled_profile.has_thread());
-    EXPECT_EQ(UI_THREAD, sampled_profile.thread());
-    ASSERT_TRUE(sampled_profile.has_trigger_event());
-    EXPECT_EQ(SampledProfile::PROCESS_STARTUP, sampled_profile.trigger_event());
+  for (size_t p = 0; p < arraysize(expected_proto_profiles); ++p) {
+    SCOPED_TRACE("profile " + base::SizeTToString(p));
+    VerifyProfileProto(expected_proto_profiles[p],
+                       uma_proto.sampled_profile().Get(p));
   }
 }
 
 // Checks that all duplicate samples are collapsed with
 // preserve_sample_ordering = false.
 TEST_F(CallStackProfileMetricsProviderTest, RepeatedStacksUnordered) {
   const uintptr_t module_base_address = 0x1000;
+  const char* module_name = "ABCD";
 
-  const Module modules[] = {
-    Module(
-        module_base_address,
-        "ABCD",
 #if defined(OS_WIN)
-        base::FilePath(L"c:\\some\\path\\to\\chrome.exe")
+  uint64_t module_md5 = 0x46C3E4166659AC02ULL;
+  base::FilePath module_path(L"c:\\some\\path\\to\\chrome.exe");
 #else
-        base::FilePath("/some/path/to/chrome")
+  uint64_t module_md5 = 0x554838A8451AC36CULL;
+  base::FilePath module_path("/some/path/to/chrome");
 #endif
-    )
+
+  ProfilesGenerator test_profiles_generator;
+  test_profiles_generator
+      .NewProfile(100, 10)
+      .DefineModule(module_name, module_path, module_base_address)
+
+      .AddPhase(0)
+      .NewSample()
+      .AddFrame(0, module_base_address + 0x10)
+      .NewSample()
+      .AddFrame(0, module_base_address + 0x20)
+      .NewSample()
+      .AddFrame(0, module_base_address + 0x10)
+      .NewSample()
+      .AddFrame(0, module_base_address + 0x10)
+
+      .AddPhase(1)
+      .NewSample()
+      .AddFrame(0, module_base_address + 0x10)
+      .NewSample()
+      .AddFrame(0, module_base_address + 0x20)
+      .NewSample()
+      .AddFrame(0, module_base_address + 0x10)
+      .NewSample()
+      .AddFrame(0, module_base_address + 0x10)
+
+      .End();
+
+  const ExpectedProtoModule expected_proto_modules[] = {
+      { module_name, module_md5, module_base_address },
   };
 
-  // Duplicate samples in slots 0, 2, and 3.
-  const Frame sample_frames[][1] = {
-    { Frame(module_base_address + 0x10, 0), },
-    { Frame(module_base_address + 0x20, 0), },
-    { Frame(module_base_address + 0x10, 0), },
-    { Frame(module_base_address + 0x10, 0) }
+  const ExpectedProtoEntry expected_proto_entries[] = {
+      { 0, 0x10 },
+      { 0, 0x20 },
+  };
+  const ExpectedProtoSample expected_proto_samples[] = {
+      { 1, &expected_proto_entries[0], 1, 3 },
+      { 0, &expected_proto_entries[1], 1, 1 },
+      { 2, &expected_proto_entries[0], 1, 3 },
+      { 0, &expected_proto_entries[1], 1, 1 },
   };
 
-  Profile profile;
-  profile.modules.insert(profile.modules.end(), &modules[0],
-      &modules[0] + arraysize(modules));
+  const ExpectedProtoProfile expected_proto_profiles[] = {
+      {
+          100, 10,
+          expected_proto_modules, arraysize(expected_proto_modules),
+          expected_proto_samples, arraysize(expected_proto_samples),
+      },
+  };
 
-  for (size_t i = 0; i < arraysize(sample_frames); ++i) {
-    profile.samples.push_back(Sample());
-    Sample& sample = profile.samples.back();
-    sample.insert(sample.end(), &sample_frames[i][0],
-                  &sample_frames[i][0] + arraysize(sample_frames[i]));
-  }
-
-  profile.profile_duration = base::TimeDelta::FromMilliseconds(100);
-  profile.sampling_period = base::TimeDelta::FromMilliseconds(10);
   Profiles profiles;
-  profiles.push_back(std::move(profile));
+  test_profiles_generator.GenerateProfiles(&profiles);
+  ASSERT_EQ(arraysize(expected_proto_profiles), profiles.size());
 
   CallStackProfileMetricsProvider provider;
   provider.OnRecordingEnabled();
   AppendProfiles(
       CallStackProfileParams(CallStackProfileParams::BROWSER_PROCESS,
                              CallStackProfileParams::UI_THREAD,
                              CallStackProfileParams::PROCESS_STARTUP,
                              CallStackProfileParams::MAY_SHUFFLE),
       std::move(profiles));
   ChromeUserMetricsExtension uma_proto;
   provider.ProvideGeneralMetrics(&uma_proto);
 
-  ASSERT_EQ(1, uma_proto.sampled_profile().size());
-  const SampledProfile& sampled_profile = uma_proto.sampled_profile().Get(0);
-  ASSERT_TRUE(sampled_profile.has_call_stack_profile());
-  const CallStackProfile& call_stack_profile =
-      sampled_profile.call_stack_profile();
-
-  ASSERT_EQ(2, call_stack_profile.sample().size());
-  for (int i = 0; i < 2; ++i) {
-    SCOPED_TRACE("sample " + base::IntToString(i));
-    const CallStackProfile::Sample& proto_sample =
-        call_stack_profile.sample().Get(i);
-    ASSERT_EQ(static_cast<int>(arraysize(sample_frames[i])),
-              proto_sample.entry().size());
-    ASSERT_TRUE(proto_sample.has_count());
-    EXPECT_EQ(i == 0 ? 3u : 1u, proto_sample.count());
-    for (size_t j = 0; j < arraysize(sample_frames[i]); ++j) {
-      SCOPED_TRACE("frame " + base::SizeTToString(j));
-      const CallStackProfile::Entry& entry = proto_sample.entry().Get(j);
-      ASSERT_TRUE(entry.has_address());
-      const char* instruction_pointer = reinterpret_cast<const char*>(
-          sample_frames[i][j].instruction_pointer);
-      const char* module_base_address = reinterpret_cast<const char*>(
-          modules[sample_frames[i][j].module_index].base_address);
-      EXPECT_EQ(
-          static_cast<uint64_t>(instruction_pointer - module_base_address),
-          entry.address());
-      ASSERT_TRUE(entry.has_module_id_index());
-      EXPECT_EQ(sample_frames[i][j].module_index,
-                static_cast<size_t>(entry.module_id_index()));
-    }
+  ASSERT_EQ(static_cast<int>(arraysize(expected_proto_profiles)),
+            uma_proto.sampled_profile().size());
+  for (size_t p = 0; p < arraysize(expected_proto_profiles); ++p) {
+    SCOPED_TRACE("profile " + base::SizeTToString(p));
+    VerifyProfileProto(expected_proto_profiles[p],
+                       uma_proto.sampled_profile().Get(p));
   }
 }
 
 // Checks that only contiguous duplicate samples are collapsed with
 // preserve_sample_ordering = true.
 TEST_F(CallStackProfileMetricsProviderTest, RepeatedStacksOrdered) {
   const uintptr_t module_base_address = 0x1000;
+  const char* module_name = "ABCD";
 
-  const Module modules[] = {
-    Module(
-        module_base_address,
-        "ABCD",
 #if defined(OS_WIN)
-        base::FilePath(L"c:\\some\\path\\to\\chrome.exe")
+  uint64_t module_md5 = 0x46C3E4166659AC02ULL;
+  base::FilePath module_path(L"c:\\some\\path\\to\\chrome.exe");
 #else
-        base::FilePath("/some/path/to/chrome")
+  uint64_t module_md5 = 0x554838A8451AC36CULL;
+  base::FilePath module_path("/some/path/to/chrome");
 #endif
-    )
+
+  ProfilesGenerator test_profiles_generator;
+  test_profiles_generator
+      .NewProfile(100, 10)
+      .DefineModule(module_name, module_path, module_base_address)
+
+      .AddPhase(0)
+      .NewSample()
+      .AddFrame(0, module_base_address + 0x10)
+      .NewSample()
+      .AddFrame(0, module_base_address + 0x20)
+      .NewSample()
+      .AddFrame(0, module_base_address + 0x10)
+      .NewSample()
+      .AddFrame(0, module_base_address + 0x10)
+
+      .AddPhase(1)
+      .NewSample()
+      .AddFrame(0, module_base_address + 0x10)
+      .NewSample()
+      .AddFrame(0, module_base_address + 0x20)
+      .NewSample()
+      .AddFrame(0, module_base_address + 0x10)
+      .NewSample()
+      .AddFrame(0, module_base_address + 0x10)
+
+      .End();
+
+  const ExpectedProtoModule expected_proto_modules[] = {
+      { module_name, module_md5, module_base_address },
   };
 
-  // Duplicate samples in slots 0, 2, and 3.
-  const Frame sample_frames[][1] = {
-    { Frame(module_base_address + 0x10, 0), },
-    { Frame(module_base_address + 0x20, 0), },
-    { Frame(module_base_address + 0x10, 0), },
-    { Frame(module_base_address + 0x10, 0) }
+  const ExpectedProtoEntry expected_proto_entries[] = {
+      { 0, 0x10 },
+      { 0, 0x20 },
+  };
+  const ExpectedProtoSample expected_proto_samples[] = {
+      { 1, &expected_proto_entries[0], 1, 1 },
+      { 0, &expected_proto_entries[1], 1, 1 },
+      { 0, &expected_proto_entries[0], 1, 2 },
+      { 2, &expected_proto_entries[0], 1, 1 },
+      { 0, &expected_proto_entries[1], 1, 1 },
+      { 0, &expected_proto_entries[0], 1, 2 },
   };
 
-  Profile profile;
-  profile.modules.insert(profile.modules.end(), &modules[0],
-      &modules[0] + arraysize(modules));
+  const ExpectedProtoProfile expected_proto_profiles[] = {
+      {
+          100, 10,
+          expected_proto_modules, arraysize(expected_proto_modules),
+          expected_proto_samples, arraysize(expected_proto_samples),
+      },
+  };
 
-  for (size_t i = 0; i < arraysize(sample_frames); ++i) {
-    profile.samples.push_back(Sample());
-    Sample& sample = profile.samples.back();
-    sample.insert(sample.end(), &sample_frames[i][0],
-                  &sample_frames[i][0] + arraysize(sample_frames[i]));
-  }
-
-  profile.profile_duration = base::TimeDelta::FromMilliseconds(100);
-  profile.sampling_period = base::TimeDelta::FromMilliseconds(10);
   Profiles profiles;
-  profiles.push_back(std::move(profile));
+  test_profiles_generator.GenerateProfiles(&profiles);
+  ASSERT_EQ(arraysize(expected_proto_profiles), profiles.size());
 
   CallStackProfileMetricsProvider provider;
   provider.OnRecordingEnabled();
   AppendProfiles(CallStackProfileParams(CallStackProfileParams::BROWSER_PROCESS,
                                         CallStackProfileParams::UI_THREAD,
                                         CallStackProfileParams::PROCESS_STARTUP,
                                         CallStackProfileParams::PRESERVE_ORDER),
                  std::move(profiles));
   ChromeUserMetricsExtension uma_proto;
   provider.ProvideGeneralMetrics(&uma_proto);
 
-  ASSERT_EQ(1, uma_proto.sampled_profile().size());
-  const SampledProfile& sampled_profile = uma_proto.sampled_profile().Get(0);
-  ASSERT_TRUE(sampled_profile.has_call_stack_profile());
-  const CallStackProfile& call_stack_profile =
-      sampled_profile.call_stack_profile();
-
-  ASSERT_EQ(3, call_stack_profile.sample().size());
-  for (int i = 0; i < 3; ++i) {
-    SCOPED_TRACE("sample " + base::IntToString(i));
-    const CallStackProfile::Sample& proto_sample =
-        call_stack_profile.sample().Get(i);
-    ASSERT_EQ(static_cast<int>(arraysize(sample_frames[i])),
-              proto_sample.entry().size());
-    ASSERT_TRUE(proto_sample.has_count());
-    EXPECT_EQ(i == 2 ? 2u : 1u, proto_sample.count());
-    for (size_t j = 0; j < arraysize(sample_frames[i]); ++j) {
-      SCOPED_TRACE("frame " + base::SizeTToString(j));
-      const CallStackProfile::Entry& entry = proto_sample.entry().Get(j);
-      ASSERT_TRUE(entry.has_address());
-      const char* instruction_pointer = reinterpret_cast<const char*>(
-          sample_frames[i][j].instruction_pointer);
-      const char* module_base_address = reinterpret_cast<const char*>(
-          modules[sample_frames[i][j].module_index].base_address);
-      EXPECT_EQ(
-          static_cast<uint64_t>(instruction_pointer - module_base_address),
-          entry.address());
-      ASSERT_TRUE(entry.has_module_id_index());
-      EXPECT_EQ(sample_frames[i][j].module_index,
-                static_cast<size_t>(entry.module_id_index()));
-    }
+  ASSERT_EQ(static_cast<int>(arraysize(expected_proto_profiles)),
+            uma_proto.sampled_profile().size());
+  for (size_t p = 0; p < arraysize(expected_proto_profiles); ++p) {
+    SCOPED_TRACE("profile " + base::SizeTToString(p));
+    VerifyProfileProto(expected_proto_profiles[p],
+                       uma_proto.sampled_profile().Get(p));
   }
 }
 
 // Checks that unknown modules produce an empty Entry.
 TEST_F(CallStackProfileMetricsProviderTest, UnknownModule) {
-  const Frame frame(0x1000, Frame::kUnknownModuleIndex);
+  ProfilesGenerator test_profiles_generator;
+  test_profiles_generator
+      .NewProfile(100, 10)
+      .NewSample()
+      .AddFrame(Frame::kUnknownModuleIndex, 0x1234)
+      .End();
 
-  Profile profile;
+  const ExpectedProtoEntry expected_proto_entries[] = {
+      { -1, 0 },
+  };
+  const ExpectedProtoSample expected_proto_samples[] = {
+      { 0, &expected_proto_entries[0], 1, 1 },
+  };
 
-  profile.samples.push_back(Sample(1, frame));
+  const ExpectedProtoProfile expected_proto_profiles[] = {
+      {
+          100, 10,
+          nullptr, 0,
+          expected_proto_samples, arraysize(expected_proto_samples),
+      },
+  };
 
-  profile.profile_duration = base::TimeDelta::FromMilliseconds(100);
-  profile.sampling_period = base::TimeDelta::FromMilliseconds(10);
   Profiles profiles;
-  profiles.push_back(std::move(profile));
+  test_profiles_generator.GenerateProfiles(&profiles);
+  ASSERT_EQ(arraysize(expected_proto_profiles), profiles.size());
 
   CallStackProfileMetricsProvider provider;
   provider.OnRecordingEnabled();
   AppendProfiles(
       CallStackProfileParams(CallStackProfileParams::BROWSER_PROCESS,
                              CallStackProfileParams::UI_THREAD,
                              CallStackProfileParams::PROCESS_STARTUP,
                              CallStackProfileParams::MAY_SHUFFLE),
       std::move(profiles));
   ChromeUserMetricsExtension uma_proto;
   provider.ProvideGeneralMetrics(&uma_proto);
 
-  ASSERT_EQ(1, uma_proto.sampled_profile().size());
-  const SampledProfile& sampled_profile = uma_proto.sampled_profile().Get(0);
-  ASSERT_TRUE(sampled_profile.has_call_stack_profile());
-  const CallStackProfile& call_stack_profile =
-      sampled_profile.call_stack_profile();
-
-  ASSERT_EQ(1, call_stack_profile.sample().size());
-  const CallStackProfile::Sample& proto_sample =
-      call_stack_profile.sample().Get(0);
-  ASSERT_EQ(1, proto_sample.entry().size());
-  ASSERT_TRUE(proto_sample.has_count());
-  EXPECT_EQ(1u, proto_sample.count());
-  const CallStackProfile::Entry& entry = proto_sample.entry().Get(0);
-  EXPECT_FALSE(entry.has_address());
-  EXPECT_FALSE(entry.has_module_id_index());
+  ASSERT_EQ(static_cast<int>(arraysize(expected_proto_profiles)),
+            uma_proto.sampled_profile().size());
+  for (size_t p = 0; p < arraysize(expected_proto_profiles); ++p) {
+    SCOPED_TRACE("profile " + base::SizeTToString(p));
+    VerifyProfileProto(expected_proto_profiles[p],
+                       uma_proto.sampled_profile().Get(p));
+  }
 }
 
 // Checks that pending profiles are only passed back to ProvideGeneralMetrics
 // once.
 TEST_F(CallStackProfileMetricsProviderTest, ProfilesProvidedOnlyOnce) {
   CallStackProfileMetricsProvider provider;
-  for (int i = 0; i < 2; ++i) {
-    Profile profile;
-    profile.samples.push_back(
-        Sample(1, Frame(0x1000, Frame::kUnknownModuleIndex)));
+  for (int r = 0; r < 2; ++r) {
+    ProfilesGenerator test_profiles_generator;
+    test_profiles_generator
+        // Use the sampling period to distinguish the two profiles.
+        .NewProfile(100, r)
+        .NewSample()
+        .AddFrame(Frame::kUnknownModuleIndex, 0x1234)
+        .End();
 
-    profile.profile_duration = base::TimeDelta::FromMilliseconds(100);
-    // Use the sampling period to distinguish the two profiles.
-    profile.sampling_period = base::TimeDelta::FromMilliseconds(i);
     Profiles profiles;
-    profiles.push_back(std::move(profile));
+    test_profiles_generator.GenerateProfiles(&profiles);
+    ASSERT_EQ(1U, profiles.size());
 
+    CallStackProfileMetricsProvider provider;
     provider.OnRecordingEnabled();
     AppendProfiles(
         CallStackProfileParams(CallStackProfileParams::BROWSER_PROCESS,
                                CallStackProfileParams::UI_THREAD,
                                CallStackProfileParams::PROCESS_STARTUP,
                                CallStackProfileParams::MAY_SHUFFLE),
         std::move(profiles));
     ChromeUserMetricsExtension uma_proto;
     provider.ProvideGeneralMetrics(&uma_proto);
 
     ASSERT_EQ(1, uma_proto.sampled_profile().size());
     const SampledProfile& sampled_profile = uma_proto.sampled_profile().Get(0);
     ASSERT_TRUE(sampled_profile.has_call_stack_profile());
     const CallStackProfile& call_stack_profile =
         sampled_profile.call_stack_profile();
     ASSERT_TRUE(call_stack_profile.has_sampling_period_ms());
-    EXPECT_EQ(i, call_stack_profile.sampling_period_ms());
+    EXPECT_EQ(r, call_stack_profile.sampling_period_ms());
   }
 }
 
 // Checks that pending profiles are provided to ProvideGeneralMetrics
 // when collected before CallStackProfileMetricsProvider is instantiated.
 TEST_F(CallStackProfileMetricsProviderTest,
        ProfilesProvidedWhenCollectedBeforeInstantiation) {
-  Profile profile;
-  profile.samples.push_back(
-      Sample(1, Frame(0x1000, Frame::kUnknownModuleIndex)));
+  ProfilesGenerator test_profiles_generator;
+  test_profiles_generator
+      .NewProfile(100, 10)
+      .NewSample()
+      .AddFrame(Frame::kUnknownModuleIndex, 0x1234)
+      .End();
 
-  profile.profile_duration = base::TimeDelta::FromMilliseconds(100);
-  profile.sampling_period = base::TimeDelta::FromMilliseconds(10);
   Profiles profiles;
-  profiles.push_back(std::move(profile));
+  test_profiles_generator.GenerateProfiles(&profiles);
+  ASSERT_EQ(1U, profiles.size());
 
   AppendProfiles(
       CallStackProfileParams(CallStackProfileParams::BROWSER_PROCESS,
                              CallStackProfileParams::UI_THREAD,
                              CallStackProfileParams::PROCESS_STARTUP,
                              CallStackProfileParams::MAY_SHUFFLE),
       std::move(profiles));
 
   CallStackProfileMetricsProvider provider;
   provider.OnRecordingEnabled();
   ChromeUserMetricsExtension uma_proto;
   provider.ProvideGeneralMetrics(&uma_proto);
 
   EXPECT_EQ(1, uma_proto.sampled_profile_size());
 }
 
 // Checks that pending profiles are not provided to ProvideGeneralMetrics
 // while recording is disabled.
 TEST_F(CallStackProfileMetricsProviderTest, ProfilesNotProvidedWhileDisabled) {
-  Profile profile;
-  profile.samples.push_back(
-      Sample(1, Frame(0x1000, Frame::kUnknownModuleIndex)));
+  ProfilesGenerator test_profiles_generator;
+  test_profiles_generator
+      .NewProfile(100, 10)
+      .NewSample()
+      .AddFrame(Frame::kUnknownModuleIndex, 0x1234)
+      .End();
 
-  profile.profile_duration = base::TimeDelta::FromMilliseconds(100);
-  profile.sampling_period = base::TimeDelta::FromMilliseconds(10);
   Profiles profiles;
-  profiles.push_back(std::move(profile));
+  test_profiles_generator.GenerateProfiles(&profiles);
+  ASSERT_EQ(1U, profiles.size());
 
   CallStackProfileMetricsProvider provider;
   provider.OnRecordingDisabled();
   AppendProfiles(
       CallStackProfileParams(CallStackProfileParams::BROWSER_PROCESS,
                              CallStackProfileParams::UI_THREAD,
                              CallStackProfileParams::PROCESS_STARTUP,
                              CallStackProfileParams::MAY_SHUFFLE),
       std::move(profiles));
   ChromeUserMetricsExtension uma_proto;
   provider.ProvideGeneralMetrics(&uma_proto);
 
   EXPECT_EQ(0, uma_proto.sampled_profile_size());
 }
 
 // Checks that pending profiles are not provided to ProvideGeneralMetrics
 // if recording is disabled while profiling.
 TEST_F(CallStackProfileMetricsProviderTest,
        ProfilesNotProvidedAfterChangeToDisabled) {
-  Profile profile;
-  profile.samples.push_back(
-      Sample(1, Frame(0x1000, Frame::kUnknownModuleIndex)));
-
-  profile.profile_duration = base::TimeDelta::FromMilliseconds(100);
-  profile.sampling_period = base::TimeDelta::FromMilliseconds(10);
+  ProfilesGenerator test_profiles_generator;
+  test_profiles_generator
+      .NewProfile(100, 10)
+      .NewSample()
+      .AddFrame(Frame::kUnknownModuleIndex, 0x1234)
+      .End();
 
   CallStackProfileMetricsProvider provider;
   provider.OnRecordingEnabled();
   base::StackSamplingProfiler::CompletedCallback callback =
       CallStackProfileMetricsProvider::GetProfilerCallback(
           CallStackProfileParams(CallStackProfileParams::BROWSER_PROCESS,
                                  CallStackProfileParams::UI_THREAD,
                                  CallStackProfileParams::PROCESS_STARTUP,
                                  CallStackProfileParams::MAY_SHUFFLE));
 
   provider.OnRecordingDisabled();
   Profiles profiles;
-  profiles.push_back(std::move(profile));
+  test_profiles_generator.GenerateProfiles(&profiles);
   callback.Run(std::move(profiles));
   ChromeUserMetricsExtension uma_proto;
   provider.ProvideGeneralMetrics(&uma_proto);
 
   EXPECT_EQ(0, uma_proto.sampled_profile_size());
 }
 
 // Checks that pending profiles are not provided to ProvideGeneralMetrics if
 // recording is enabled, but then disabled and reenabled while profiling.
 TEST_F(CallStackProfileMetricsProviderTest,
        ProfilesNotProvidedAfterChangeToDisabledThenEnabled) {
-  Profile profile;
-  profile.samples.push_back(
-      Sample(1, Frame(0x1000, Frame::kUnknownModuleIndex)));
-
-  profile.profile_duration = base::TimeDelta::FromMilliseconds(100);
-  profile.sampling_period = base::TimeDelta::FromMilliseconds(10);
+  ProfilesGenerator test_profiles_generator;
+  test_profiles_generator
+      .NewProfile(100, 10)
+      .NewSample()
+      .AddFrame(Frame::kUnknownModuleIndex, 0x1234)
+      .End();
 
   CallStackProfileMetricsProvider provider;
   provider.OnRecordingEnabled();
   base::StackSamplingProfiler::CompletedCallback callback =
       CallStackProfileMetricsProvider::GetProfilerCallback(
           CallStackProfileParams(CallStackProfileParams::BROWSER_PROCESS,
                                  CallStackProfileParams::UI_THREAD,
                                  CallStackProfileParams::PROCESS_STARTUP,
                                  CallStackProfileParams::MAY_SHUFFLE));
 
   provider.OnRecordingDisabled();
   provider.OnRecordingEnabled();
   Profiles profiles;
-  profiles.push_back(std::move(profile));
+  test_profiles_generator.GenerateProfiles(&profiles);
   callback.Run(std::move(profiles));
   ChromeUserMetricsExtension uma_proto;
   provider.ProvideGeneralMetrics(&uma_proto);
 
   EXPECT_EQ(0, uma_proto.sampled_profile_size());
 }
 
 // Checks that pending profiles are not provided to ProvideGeneralMetrics
 // if recording is disabled, but then enabled while profiling.
 TEST_F(CallStackProfileMetricsProviderTest,
        ProfilesNotProvidedAfterChangeFromDisabled) {
-  Profile profile;
-  profile.samples.push_back(
-      Sample(1, Frame(0x1000, Frame::kUnknownModuleIndex)));
-
-  profile.profile_duration = base::TimeDelta::FromMilliseconds(100);
-  profile.sampling_period = base::TimeDelta::FromMilliseconds(10);
+  ProfilesGenerator test_profiles_generator;
+  test_profiles_generator
+      .NewProfile(100, 10)
+      .NewSample()
+      .AddFrame(Frame::kUnknownModuleIndex, 0x1234)
+      .End();
 
   CallStackProfileMetricsProvider provider;
   provider.OnRecordingDisabled();
   base::StackSamplingProfiler::CompletedCallback callback =
       CallStackProfileMetricsProvider::GetProfilerCallback(
           CallStackProfileParams(CallStackProfileParams::BROWSER_PROCESS,
                                  CallStackProfileParams::UI_THREAD,
                                  CallStackProfileParams::PROCESS_STARTUP,
                                  CallStackProfileParams::MAY_SHUFFLE));
 
   provider.OnRecordingEnabled();
   Profiles profiles;
-  profiles.push_back(std::move(profile));
+  test_profiles_generator.GenerateProfiles(&profiles);
   callback.Run(std::move(profiles));
   ChromeUserMetricsExtension uma_proto;
   provider.ProvideGeneralMetrics(&uma_proto);
 
   EXPECT_EQ(0, uma_proto.sampled_profile_size());
 }
 
 }  // namespace metrics