Revert "Eliminate all code related to the AutomaticProfileResetter."

chrome/browser/profile_resetter/automatic_profile_resetter.cc

+// Copyright 2013 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/browser/profile_resetter/automatic_profile_resetter.h"
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/logging.h"
+#include "base/memory/ref_counted.h"
+#include "base/metrics/field_trial.h"
+#include "base/metrics/histogram.h"
+#include "base/metrics/sparse_histogram.h"
+#include "base/prefs/pref_service.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_util.h"
+#include "base/task_runner.h"
+#include "base/task_runner_util.h"
+#include "base/threading/sequenced_worker_pool.h"
+#include "base/time/time.h"
+#include "base/timer/elapsed_timer.h"
+#include "base/values.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/profile_resetter/automatic_profile_resetter_delegate.h"
+#include "chrome/browser/profile_resetter/jtl_interpreter.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/search_engines/template_url_service_factory.h"
+#include "components/search_engines/template_url_service.h"
+#include "components/variations/variations_associated_data.h"
+#include "content/public/browser/browser_thread.h"
+#include "grit/browser_resources.h"
+#include "ui/base/resource/resource_bundle.h"
+
+
+// Helpers -------------------------------------------------------------------
+
+namespace {
+
+// Name constants for the field trial behind which we enable this feature.
+const char kAutomaticProfileResetStudyName[] = "AutomaticProfileReset";
+const char kAutomaticProfileResetStudyDryRunGroupName[] = "DryRun";
+const char kAutomaticProfileResetStudyEnabledGroupName[] = "Enabled";
+#if defined(GOOGLE_CHROME_BUILD)
+const char kAutomaticProfileResetStudyProgramParameterName[] = "program";
+const char kAutomaticProfileResetStudyHashSeedParameterName[] = "hash_seed";
+#endif
+
+// How long to wait after start-up before unleashing the evaluation flow.
+const int64 kEvaluationFlowDelayInSeconds = 55;
+
+// Keys used in the input dictionary of the program.
+const char kDefaultSearchProviderKey[] = "default_search_provider";
+const char kDefaultSearchProviderIsUserControlledKey[] =
+    "default_search_provider_iuc";
+const char kLoadedModuleDigestsKey[] = "loaded_modules";
+const char kLocalStateKey[] = "local_state";
+const char kLocalStateIsUserControlledKey[] = "local_state_iuc";
+const char kSearchProvidersKey[] = "search_providers";
+const char kUserPreferencesKey[] = "preferences";
+const char kUserPreferencesIsUserControlledKey[] = "preferences_iuc";
+
+// Keys used in the output dictionary of the program.
+const char kCombinedStatusMaskKeyPrefix[] = "combined_status_mask_bit";
+const char kHadPromptedAlreadyKey[] = "had_prompted_already";
+const char kShouldPromptKey[] = "should_prompt";
+const char kSatisfiedCriteriaMaskKeyPrefix[] = "satisfied_criteria_mask_bit";
+
+// Keys used in both the input and output dictionary of the program.
+const char kMementoValueInFileKey[] = "memento_value_in_file";
+const char kMementoValueInLocalStateKey[] = "memento_value_in_local_state";
+const char kMementoValueInPrefsKey[] = "memento_value_in_prefs";
+
+// Number of bits, and maximum value (exclusive) for the mask whose bits
+// indicate which of reset criteria were satisfied.
+const size_t kSatisfiedCriteriaMaskNumberOfBits = 5u;
+const uint32 kSatisfiedCriteriaMaskMaximumValue =
+    (1u << kSatisfiedCriteriaMaskNumberOfBits);
+
+// Number of bits, and maximum value (exclusive) for the mask whose bits
+// indicate if any of reset criteria were satisfied, and which of the mementos
+// were already present.
+const size_t kCombinedStatusMaskNumberOfBits = 4u;
+const uint32 kCombinedStatusMaskMaximumValue =
+    (1u << kCombinedStatusMaskNumberOfBits);
+
+// Returns whether or not a dry-run shall be performed.
+bool ShouldPerformDryRun() {
+  return StartsWithASCII(
+      base::FieldTrialList::FindFullName(kAutomaticProfileResetStudyName),
+      kAutomaticProfileResetStudyDryRunGroupName, true);
+}
+
+// Returns whether or not a live-run shall be performed.
+bool ShouldPerformLiveRun() {
+  return StartsWithASCII(
+      base::FieldTrialList::FindFullName(kAutomaticProfileResetStudyName),
+      kAutomaticProfileResetStudyEnabledGroupName, true);
+}
+
+// If the currently active experiment group prescribes a |program| and
+// |hash_seed| to use instead of the baked-in ones, retrieves those and returns
+// true. Otherwise, returns false.
+bool GetProgramAndHashSeedOverridesFromExperiment(std::string* program,
+                                                  std::string* hash_seed) {
+  DCHECK(program);
+  DCHECK(hash_seed);
+#if defined(GOOGLE_CHROME_BUILD)
+  std::map<std::string, std::string> params;
+  variations::GetVariationParams(kAutomaticProfileResetStudyName, &params);
+  if (params.count(kAutomaticProfileResetStudyProgramParameterName) &&
+      params.count(kAutomaticProfileResetStudyHashSeedParameterName)) {
+    program->swap(params[kAutomaticProfileResetStudyProgramParameterName]);
+    hash_seed->swap(params[kAutomaticProfileResetStudyHashSeedParameterName]);
+    return true;
+  }
+#endif
+  return false;
+}
+
+// Takes |pref_name_to_value_map|, which shall be a deep-copy of all preferences
+// in |source| without path expansion; and (1.) creates a sub-tree from it named
+// |value_tree_key| in |target_dictionary| with path expansion, and (2.) also
+// creates an isomorphic sub-tree under the key |is_user_controlled_tree_key|
+// that contains only Boolean values indicating whether or not the corresponding
+// preference is coming from the 'user' PrefStore.
+void BuildSubTreesFromPreferences(
+    scoped_ptr<base::DictionaryValue> pref_name_to_value_map,
+    const PrefService* source,
+    const char* value_tree_key,
+    const char* is_user_controlled_tree_key,
+    base::DictionaryValue* target_dictionary) {
+  std::vector<std::string> pref_names;
+  pref_names.reserve(pref_name_to_value_map->size());
+  for (base::DictionaryValue::Iterator it(*pref_name_to_value_map);
+       !it.IsAtEnd(); it.Advance())
+    pref_names.push_back(it.key());
+
+  base::DictionaryValue* value_tree = new base::DictionaryValue;
+  base::DictionaryValue* is_user_controlled_tree = new base::DictionaryValue;
+  for (std::vector<std::string>::const_iterator it = pref_names.begin();
+       it != pref_names.end(); ++it) {
+    scoped_ptr<base::Value> pref_value_owned;
+    if (pref_name_to_value_map->RemoveWithoutPathExpansion(*it,
+                                                           &pref_value_owned)) {
+      value_tree->Set(*it, pref_value_owned.release());
+      const PrefService::Preference* pref = source->FindPreference(it->c_str());
+      is_user_controlled_tree->Set(
+          *it, new base::FundamentalValue(pref->IsUserControlled()));
+    }
+  }
+  target_dictionary->Set(value_tree_key, value_tree);
+  target_dictionary->Set(is_user_controlled_tree_key, is_user_controlled_tree);
+}
+
+}  // namespace
+
+
+// AutomaticProfileResetter::InputBuilder ------------------------------------
+
+// Collects all the information that is required by the evaluator program to
+// assess whether or not the conditions for showing the reset prompt are met.
+//
+// This necessitates a lot of work that has to be performed on the UI thread,
+// such as: accessing the Preferences, Local State, and TemplateURLService.
+// In order to keep the browser responsive, the UI thread shall not be blocked
+// for long consecutive periods of time. Unfortunately, we cannot reduce the
+// total amount of work. Instead, what this class does is to split the work into
+// shorter tasks that are posted one-at-a-time to the UI thread in a serial
+// fashion, so as to give a chance to run other tasks that have accumulated in
+// the meantime.
+class AutomaticProfileResetter::InputBuilder
+    : public base::SupportsWeakPtr<InputBuilder> {
+ public:
+  typedef base::Callback<void(scoped_ptr<base::DictionaryValue>)>
+      ProgramInputCallback;
+
+  // The dependencies must have been initialized through |delegate|, i.e. the
+  // RequestCallback[...] methods must have already fired before calling this.
+  InputBuilder(Profile* profile, AutomaticProfileResetterDelegate* delegate)
+      : profile_(profile),
+        delegate_(delegate),
+        memento_in_prefs_(profile_),
+        memento_in_local_state_(profile_),
+        memento_in_file_(profile_) {}
+  ~InputBuilder() {}
+
+  // Assembles the data required by the evaluator program into a dictionary
+  // format, and posts it back to the UI thread with |callback| once ready. In
+  // order not to block the UI thread for long consecutive periods of time, the
+  // work is divided into smaller tasks, see class comment above for details.
+  // It is safe to destroy |this| immediately from within the |callback|.
+  void BuildEvaluatorProgramInput(const ProgramInputCallback& callback) {
+    DCHECK(!data_);
+    DCHECK(!callback.is_null());
+    data_.reset(new base::DictionaryValue);
+    callback_ = callback;
+
+    AddAsyncTask(base::Bind(&InputBuilder::IncludeMementoValues, AsWeakPtr()));
+    AddTask(base::Bind(&InputBuilder::IncludeUserPreferences, AsWeakPtr()));
+    AddTask(base::Bind(&InputBuilder::IncludeLocalState, AsWeakPtr()));
+    AddTask(base::Bind(&InputBuilder::IncludeSearchEngines, AsWeakPtr()));
+    AddTask(base::Bind(&InputBuilder::IncludeLoadedModules, AsWeakPtr()));
+
+    // Each task will post the next one. Just trigger the chain reaction.
+    PostNextTask();
+  }
+
+ private:
+  // Asynchronous task that includes memento values (or empty strings in case
+  // mementos are not there).
+  void IncludeMementoValues() {
+    data_->SetString(kMementoValueInPrefsKey, memento_in_prefs_.ReadValue());
+    data_->SetString(kMementoValueInLocalStateKey,
+                     memento_in_local_state_.ReadValue());
+    memento_in_file_.ReadValue(base::Bind(
+        &InputBuilder::IncludeFileBasedMementoCallback, AsWeakPtr()));
+  }
+
+  // Called back by |memento_in_file_| once the |memento_value| has been read.
+  void IncludeFileBasedMementoCallback(const std::string& memento_value) {
+    DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+    data_->SetString(kMementoValueInFileKey, memento_value);
+    // As an asynchronous task, we need to take care of posting the next task.
+    PostNextTask();
+  }
+
+  // Task that includes all user (i.e. profile-specific) preferences, along with
+  // information about whether the value is coming from the 'user' PrefStore.
+  // This is the most expensive operation, so it is itself split into two parts.
+  void IncludeUserPreferences() {
+    PrefService* prefs = profile_->GetPrefs();
+    DCHECK(prefs);
+    scoped_ptr<base::DictionaryValue> pref_name_to_value_map(
+        prefs->GetPreferenceValuesWithoutPathExpansion());
+    AddTask(base::Bind(&InputBuilder::IncludeUserPreferencesPartTwo,
+                       AsWeakPtr(),
+                       base::Passed(&pref_name_to_value_map)));
+  }
+
+  // Second part to above.
+  void IncludeUserPreferencesPartTwo(
+      scoped_ptr<base::DictionaryValue> pref_name_to_value_map) {
+    PrefService* prefs = profile_->GetPrefs();
+    DCHECK(prefs);
+    BuildSubTreesFromPreferences(
+        pref_name_to_value_map.Pass(),
+        prefs,
+        kUserPreferencesKey,
+        kUserPreferencesIsUserControlledKey,
+        data_.get());
+  }
+
+  // Task that includes all local state (i.e. shared) preferences, along with
+  // information about whether the value is coming from the 'user' PrefStore.
+  void IncludeLocalState() {
+    PrefService* local_state = g_browser_process->local_state();
+    DCHECK(local_state);
+    scoped_ptr<base::DictionaryValue> pref_name_to_value_map(
+        local_state->GetPreferenceValuesWithoutPathExpansion());
+    BuildSubTreesFromPreferences(
+        pref_name_to_value_map.Pass(),
+        local_state,
+        kLocalStateKey,
+        kLocalStateIsUserControlledKey,
+        data_.get());
+  }
+
+  // Task that includes all information related to search engines.
+  void IncludeSearchEngines() {
+    scoped_ptr<base::DictionaryValue> default_search_provider_details(
+        delegate_->GetDefaultSearchProviderDetails());
+    data_->Set(kDefaultSearchProviderKey,
+               default_search_provider_details.release());
+
+    scoped_ptr<base::ListValue> search_providers_details(
+        delegate_->GetPrepopulatedSearchProvidersDetails());
+    data_->Set(kSearchProvidersKey, search_providers_details.release());
+
+    data_->SetBoolean(kDefaultSearchProviderIsUserControlledKey,
+                      !delegate_->IsDefaultSearchProviderManaged());
+  }
+
+  // Task that includes information about loaded modules.
+  void IncludeLoadedModules() {
+    scoped_ptr<base::ListValue> loaded_module_digests(
+        delegate_->GetLoadedModuleNameDigests());
+    data_->Set(kLoadedModuleDigestsKey, loaded_module_digests.release());
+  }
+
+  // -------------------------------------------------------------------------
+
+  // Adds a |task| that can do as much asynchronous processing as it wants, but
+  // will need to finally call PostNextTask() on the UI thread when done.
+  void AddAsyncTask(const base::Closure& task) {
+    task_queue_.push(task);
+  }
+
+  // Convenience wrapper for synchronous tasks.
+  void SynchronousTaskWrapper(const base::Closure& task) {
+    base::ElapsedTimer timer;
+    task.Run();
+    UMA_HISTOGRAM_CUSTOM_TIMES(
+        "AutomaticProfileReset.InputBuilder.TaskDuration",
+        timer.Elapsed(),
+        base::TimeDelta::FromMilliseconds(1),
+        base::TimeDelta::FromSeconds(2),
+        50);
+    PostNextTask();
+  }
+
+  // Adds a task that needs to finish synchronously. In exchange, PostNextTask()
+  // is called automatically when the |task| returns, and execution time is
+  // measured.
+  void AddTask(const base::Closure& task) {
+    task_queue_.push(
+        base::Bind(&InputBuilder::SynchronousTaskWrapper, AsWeakPtr(), task));
+  }
+
+  // Posts the next task from the |task_queue_|, unless it is exhausted, in
+  // which case it posts |callback_| to return with the results.
+  void PostNextTask() {
+    base::Closure next_task;
+    if (task_queue_.empty()) {
+      next_task = base::Bind(callback_, base::Passed(&data_));
+    } else {
+      next_task = task_queue_.front();
+      task_queue_.pop();
+    }
+    content::BrowserThread::PostTask(
+        content::BrowserThread::UI, FROM_HERE, next_task);
+  }
+
+  Profile* profile_;
+  AutomaticProfileResetterDelegate* delegate_;
+  ProgramInputCallback callback_;
+
+  PreferenceHostedPromptMemento memento_in_prefs_;
+  LocalStateHostedPromptMemento memento_in_local_state_;
+  FileHostedPromptMemento memento_in_file_;
+
+  scoped_ptr<base::DictionaryValue> data_;
+  std::queue<base::Closure> task_queue_;
+
+  DISALLOW_COPY_AND_ASSIGN(InputBuilder);
+};
+
+
+// AutomaticProfileResetter::EvaluationResults -------------------------------
+
+// Encapsulates the output values extracted from the evaluator program.
+struct AutomaticProfileResetter::EvaluationResults {
+  EvaluationResults()
+      : should_prompt(false),
+        had_prompted_already(false),
+        satisfied_criteria_mask(0),
+        combined_status_mask(0) {}
+
+  std::string memento_value_in_prefs;
+  std::string memento_value_in_local_state;
+  std::string memento_value_in_file;
+
+  bool should_prompt;
+  bool had_prompted_already;
+  uint32 satisfied_criteria_mask;
+  uint32 combined_status_mask;
+};
+
+
+// AutomaticProfileResetter --------------------------------------------------
+
+AutomaticProfileResetter::AutomaticProfileResetter(Profile* profile)
+    : profile_(profile),
+      state_(STATE_UNINITIALIZED),
+      enumeration_of_loaded_modules_ready_(false),
+      template_url_service_ready_(false),
+      has_already_dismissed_prompt_(false),
+      should_show_reset_banner_(false),
+      weak_ptr_factory_(this) {
+  DCHECK(profile_);
+}
+
+AutomaticProfileResetter::~AutomaticProfileResetter() {}
+
+void AutomaticProfileResetter::Initialize() {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DCHECK_EQ(state_, STATE_UNINITIALIZED);
+
+  if (!ShouldPerformDryRun() && !ShouldPerformLiveRun()) {
+    state_ = STATE_DISABLED;
+    return;
+  }
+
+  if (!GetProgramAndHashSeedOverridesFromExperiment(&program_, &hash_seed_)) {
+    ui::ResourceBundle& resources(ui::ResourceBundle::GetSharedInstance());
+    if (ShouldPerformLiveRun()) {
+      program_ = resources.GetRawDataResource(
+          IDR_AUTOMATIC_PROFILE_RESET_RULES).as_string();
+      hash_seed_ = resources.GetRawDataResource(
+          IDR_AUTOMATIC_PROFILE_RESET_HASH_SEED).as_string();
+    } else {  // ShouldPerformDryRun()
+      program_ = resources.GetRawDataResource(
+          IDR_AUTOMATIC_PROFILE_RESET_RULES_DRY).as_string();
+      hash_seed_ = resources.GetRawDataResource(
+          IDR_AUTOMATIC_PROFILE_RESET_HASH_SEED_DRY).as_string();
+    }
+  }
+
+  delegate_.reset(new AutomaticProfileResetterDelegateImpl(
+      profile_, ProfileResetter::ALL));
+  task_runner_for_waiting_ =
+      content::BrowserThread::GetMessageLoopProxyForThread(
+          content::BrowserThread::UI);
+
+  state_ = STATE_INITIALIZED;
+}
+
+void AutomaticProfileResetter::Activate() {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DCHECK(state_ == STATE_INITIALIZED || state_ == STATE_DISABLED);
+
+  if (state_ == STATE_INITIALIZED) {
+    if (!program_.empty()) {
+      // Some steps in the flow (e.g. loaded modules, file-based memento) are
+      // IO-intensive, so defer execution until some time later.
+      task_runner_for_waiting_->PostDelayedTask(
+          FROM_HERE,
+          base::Bind(&AutomaticProfileResetter::PrepareEvaluationFlow,
+                     weak_ptr_factory_.GetWeakPtr()),
+          base::TimeDelta::FromSeconds(kEvaluationFlowDelayInSeconds));
+    } else {
+      // Terminate early if there is no program included (nor set by tests).
+      state_ = STATE_DISABLED;
+    }
+  }
+}
+
+void AutomaticProfileResetter::TriggerProfileReset(bool send_feedback) {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DCHECK_EQ(state_, STATE_HAS_SHOWN_BUBBLE);
+
+  state_ = STATE_PERFORMING_RESET;
+  should_show_reset_banner_ = false;
+
+  ReportPromptResult(PROMPT_ACTION_RESET);
+  delegate_->TriggerProfileSettingsReset(
+      send_feedback,
+      base::Bind(&AutomaticProfileResetter::OnProfileSettingsResetCompleted,
+                 weak_ptr_factory_.GetWeakPtr()));
+}
+
+void AutomaticProfileResetter::SkipProfileReset() {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DCHECK_EQ(state_, STATE_HAS_SHOWN_BUBBLE);
+
+  should_show_reset_banner_ = false;
+
+  ReportPromptResult(PROMPT_ACTION_NO_RESET);
+  delegate_->DismissPrompt();
+  FinishResetPromptFlow();
+}
+
+bool AutomaticProfileResetter::IsResetPromptFlowActive() const {
+  return state_ == STATE_HAS_TRIGGERED_PROMPT ||
+      state_ == STATE_HAS_SHOWN_BUBBLE;
+}
+
+bool AutomaticProfileResetter::ShouldShowResetBanner() const {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  return should_show_reset_banner_ && ShouldPerformLiveRun();
+}
+
+void AutomaticProfileResetter::NotifyDidShowResetBubble() {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DCHECK_EQ(state_, STATE_HAS_TRIGGERED_PROMPT);
+
+  state_ = STATE_HAS_SHOWN_BUBBLE;
+
+  PersistMementos();
+  ReportPromptResult(PROMPT_SHOWN_BUBBLE);
+}
+
+void AutomaticProfileResetter::NotifyDidOpenWebUIResetDialog() {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+
+  // This notification is invoked unconditionally by the WebUI, only care about
+  // it when the prompt flow is currently active (and not yet resetting).
+  if (state_ == STATE_HAS_TRIGGERED_PROMPT ||
+      state_ == STATE_HAS_SHOWN_BUBBLE) {
+    has_already_dismissed_prompt_ = true;
+    delegate_->DismissPrompt();
+  }
+}
+
+void AutomaticProfileResetter::NotifyDidCloseWebUIResetDialog(
+    bool performed_reset) {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+
+  // This notification is invoked unconditionally by the WebUI, only care about
+  // it when the prompt flow is currently active (and not yet resetting).
+  if (state_ == STATE_HAS_TRIGGERED_PROMPT ||
+      state_ == STATE_HAS_SHOWN_BUBBLE) {
+    if (!has_already_dismissed_prompt_)
+      delegate_->DismissPrompt();
+    if (state_ == STATE_HAS_TRIGGERED_PROMPT) {
+      PersistMementos();
+      ReportPromptResult(performed_reset ?
+          PROMPT_NOT_SHOWN_BUBBLE_BUT_HAD_WEBUI_RESET :
+          PROMPT_NOT_SHOWN_BUBBLE_BUT_HAD_WEBUI_NO_RESET);
+    } else {  // if (state_ == STATE_HAS_SHOWN_PROMPT)
+      ReportPromptResult(performed_reset ?
+          PROMPT_FOLLOWED_BY_WEBUI_RESET :
+          PROMPT_FOLLOWED_BY_WEBUI_NO_RESET);
+    }
+    FinishResetPromptFlow();
+  }
+}
+
+void AutomaticProfileResetter::NotifyDidCloseWebUIResetBanner() {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  should_show_reset_banner_ = false;
+}
+
+void AutomaticProfileResetter::SetProgramForTesting(
+    const std::string& program) {
+  program_ = program;
+}
+
+void AutomaticProfileResetter::SetHashSeedForTesting(
+    const std::string& hash_key) {
+  hash_seed_ = hash_key;
+}
+
+void AutomaticProfileResetter::SetDelegateForTesting(
+    scoped_ptr<AutomaticProfileResetterDelegate> delegate) {
+  delegate_ = delegate.Pass();
+}
+
+void AutomaticProfileResetter::SetTaskRunnerForWaitingForTesting(
+    const scoped_refptr<base::TaskRunner>& task_runner) {
+  task_runner_for_waiting_ = task_runner;
+}
+
+void AutomaticProfileResetter::Shutdown() {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+
+  // We better not do anything substantial at this point. The metrics service
+  // has already been shut down; and local state has already been commited to
+  // file (in the regular fashion) for the last time.
+
+  state_ = STATE_DISABLED;
+
+  weak_ptr_factory_.InvalidateWeakPtrs();
+  delegate_.reset();
+}
+
+void AutomaticProfileResetter::PrepareEvaluationFlow() {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DCHECK_EQ(state_, STATE_INITIALIZED);
+
+  state_ = STATE_WAITING_ON_DEPENDENCIES;
+
+  delegate_->RequestCallbackWhenTemplateURLServiceIsLoaded(
+      base::Bind(&AutomaticProfileResetter::OnTemplateURLServiceIsLoaded,
+                 weak_ptr_factory_.GetWeakPtr()));
+  delegate_->RequestCallbackWhenLoadedModulesAreEnumerated(
+      base::Bind(&AutomaticProfileResetter::OnLoadedModulesAreEnumerated,
+                 weak_ptr_factory_.GetWeakPtr()));
+  delegate_->LoadTemplateURLServiceIfNeeded();
+  delegate_->EnumerateLoadedModulesIfNeeded();
+}
+
+void AutomaticProfileResetter::OnTemplateURLServiceIsLoaded() {
+  template_url_service_ready_ = true;
+  OnDependencyIsReady();
+}
+
+void AutomaticProfileResetter::OnLoadedModulesAreEnumerated() {
+  enumeration_of_loaded_modules_ready_ = true;
+  OnDependencyIsReady();
+}
+
+void AutomaticProfileResetter::OnDependencyIsReady() {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DCHECK_EQ(state_, STATE_WAITING_ON_DEPENDENCIES);
+
+  if (template_url_service_ready_ && enumeration_of_loaded_modules_ready_) {
+    state_ = STATE_READY;
+    content::BrowserThread::PostTask(
+        content::BrowserThread::UI,
+        FROM_HERE,
+        base::Bind(&AutomaticProfileResetter::BeginEvaluationFlow,
+                   weak_ptr_factory_.GetWeakPtr()));
+  }
+}
+
+void AutomaticProfileResetter::BeginEvaluationFlow() {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DCHECK_EQ(state_, STATE_READY);
+  DCHECK(!program_.empty());
+  DCHECK(!input_builder_);
+
+  state_ = STATE_EVALUATING_CONDITIONS;
+
+  input_builder_.reset(new InputBuilder(profile_, delegate_.get()));
+  input_builder_->BuildEvaluatorProgramInput(
+      base::Bind(&AutomaticProfileResetter::ContinueWithEvaluationFlow,
+                 weak_ptr_factory_.GetWeakPtr()));
+}
+
+void AutomaticProfileResetter::ContinueWithEvaluationFlow(
+    scoped_ptr<base::DictionaryValue> program_input) {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DCHECK_EQ(state_, STATE_EVALUATING_CONDITIONS);
+
+  input_builder_.reset();
+
+  base::SequencedWorkerPool* blocking_pool =
+      content::BrowserThread::GetBlockingPool();
+  scoped_refptr<base::TaskRunner> task_runner =
+      blocking_pool->GetTaskRunnerWithShutdownBehavior(
+          base::SequencedWorkerPool::SKIP_ON_SHUTDOWN);
+
+  base::PostTaskAndReplyWithResult(
+      task_runner.get(),
+      FROM_HERE,
+      base::Bind(&EvaluateConditionsOnWorkerPoolThread,
+                 hash_seed_,
+                 program_,
+                 base::Passed(&program_input)),
+      base::Bind(&AutomaticProfileResetter::FinishEvaluationFlow,
+                 weak_ptr_factory_.GetWeakPtr()));
+}
+
+// static
+scoped_ptr<AutomaticProfileResetter::EvaluationResults>
+    AutomaticProfileResetter::EvaluateConditionsOnWorkerPoolThread(
+    const std::string& hash_seed,
+    const std::string& program,
+    scoped_ptr<base::DictionaryValue> program_input) {
+  JtlInterpreter interpreter(hash_seed, program, program_input.get());
+  interpreter.Execute();
+  UMA_HISTOGRAM_ENUMERATION("AutomaticProfileReset.InterpreterResult",
+                            interpreter.result(),
+                            JtlInterpreter::RESULT_MAX);
+  UMA_HISTOGRAM_SPARSE_SLOWLY("AutomaticProfileReset.ProgramChecksum",
+                              interpreter.CalculateProgramChecksum());
+
+  // In each case below, the respective field in result originally contains the
+  // default, so if the getter fails, we still have the correct value there.
+  scoped_ptr<EvaluationResults> results(new EvaluationResults);
+  interpreter.GetOutputBoolean(kShouldPromptKey, &results->should_prompt);
+  interpreter.GetOutputBoolean(kHadPromptedAlreadyKey,
+                               &results->had_prompted_already);
+  interpreter.GetOutputString(kMementoValueInPrefsKey,
+                              &results->memento_value_in_prefs);
+  interpreter.GetOutputString(kMementoValueInLocalStateKey,
+                              &results->memento_value_in_local_state);
+  interpreter.GetOutputString(kMementoValueInFileKey,
+                              &results->memento_value_in_file);
+  for (size_t i = 0; i < kCombinedStatusMaskNumberOfBits; ++i) {
+    bool flag = false;
+    std::string mask_i_th_bit_key =
+        kCombinedStatusMaskKeyPrefix + base::IntToString(i + 1);
+    if (interpreter.GetOutputBoolean(mask_i_th_bit_key, &flag) && flag)
+      results->combined_status_mask |= (1 << i);
+  }
+  for (size_t i = 0; i < kSatisfiedCriteriaMaskNumberOfBits; ++i) {
+    bool flag = false;
+    std::string mask_i_th_bit_key =
+        kSatisfiedCriteriaMaskKeyPrefix + base::IntToString(i + 1);
+    if (interpreter.GetOutputBoolean(mask_i_th_bit_key, &flag) && flag)
+      results->satisfied_criteria_mask |= (1 << i);
+  }
+  return results.Pass();
+}
+
+void AutomaticProfileResetter::ReportStatistics(uint32 satisfied_criteria_mask,
+                                                uint32 combined_status_mask) {
+  UMA_HISTOGRAM_ENUMERATION("AutomaticProfileReset.SatisfiedCriteriaMask",
+                            satisfied_criteria_mask,
+                            kSatisfiedCriteriaMaskMaximumValue);
+  UMA_HISTOGRAM_ENUMERATION("AutomaticProfileReset.CombinedStatusMask",
+                            combined_status_mask,
+                            kCombinedStatusMaskMaximumValue);
+}
+
+void AutomaticProfileResetter::FinishEvaluationFlow(
+    scoped_ptr<EvaluationResults> results) {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DCHECK_EQ(state_, STATE_EVALUATING_CONDITIONS);
+
+  ReportStatistics(results->satisfied_criteria_mask,
+                   results->combined_status_mask);
+
+  if (results->should_prompt)
+    should_show_reset_banner_ = true;
+
+  if (results->should_prompt && !results->had_prompted_already) {
+    evaluation_results_ = results.Pass();
+    BeginResetPromptFlow();
+  } else {
+    state_ = STATE_DONE;
+  }
+}
+
+void AutomaticProfileResetter::BeginResetPromptFlow() {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DCHECK_EQ(state_, STATE_EVALUATING_CONDITIONS);
+
+  state_ = STATE_HAS_TRIGGERED_PROMPT;
+
+  if (ShouldPerformLiveRun() && delegate_->TriggerPrompt()) {
+    // Start fetching the brandcoded default settings speculatively in the
+    // background, so as to reduce waiting time if the user chooses to go
+    // through with the reset.
+    delegate_->FetchBrandcodedDefaultSettingsIfNeeded();
+  } else {
+    PersistMementos();
+    ReportPromptResult(PROMPT_NOT_TRIGGERED);
+    FinishResetPromptFlow();
+  }
+}
+
+void AutomaticProfileResetter::OnProfileSettingsResetCompleted() {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DCHECK_EQ(state_, STATE_PERFORMING_RESET);
+
+  delegate_->DismissPrompt();
+  FinishResetPromptFlow();
+}
+
+void AutomaticProfileResetter::ReportPromptResult(PromptResult result) {
+  UMA_HISTOGRAM_ENUMERATION(
+      "AutomaticProfileReset.PromptResult", result, PROMPT_RESULT_MAX);
+}
+
+void AutomaticProfileResetter::PersistMementos() {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DCHECK(state_ == STATE_HAS_TRIGGERED_PROMPT ||
+         state_ == STATE_HAS_SHOWN_BUBBLE);
+  DCHECK(evaluation_results_);
+
+  PreferenceHostedPromptMemento memento_in_prefs(profile_);
+  LocalStateHostedPromptMemento memento_in_local_state(profile_);
+  FileHostedPromptMemento memento_in_file(profile_);
+
+  memento_in_prefs.StoreValue(evaluation_results_->memento_value_in_prefs);
+  memento_in_local_state.StoreValue(
+      evaluation_results_->memento_value_in_local_state);
+  memento_in_file.StoreValue(evaluation_results_->memento_value_in_file);
+
+  evaluation_results_.reset();
+}
+
+void AutomaticProfileResetter::FinishResetPromptFlow() {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DCHECK(state_ == STATE_HAS_TRIGGERED_PROMPT ||
+         state_ == STATE_HAS_SHOWN_BUBBLE ||
+         state_ == STATE_PERFORMING_RESET);
+  DCHECK(!evaluation_results_);
+
+  state_ = STATE_DONE;
+}