Variations seed is pulled from the Java application on the first launch of Chrome

components/variations/variations_seed_store.cc

 // Copyright 2014 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/variations/variations_seed_store.h"
 
 #include "base/base64.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/numerics/safe_math.h"
 #include "base/prefs/pref_registry_simple.h"
@@ skipping 134 matching lines @@
 VariationsSeedStore::VariationsSeedStore(PrefService* local_state)
     : local_state_(local_state), seed_has_country_code_(false) {
 }
 
 VariationsSeedStore::~VariationsSeedStore() {
 }
 
 bool VariationsSeedStore::LoadSeed(variations::VariationsSeed* seed) {
   invalid_base64_signature_.clear();
 
+#if defined(OS_ANDROID)
+  if (!local_state_->HasPrefPath(prefs::kVariationsSeedSignature))
+    ImportFirstRunJavaSeed();
+#endif  // OS_ANDROID
+
   std::string seed_data;
   if (!ReadSeedData(&seed_data))
     return false;
 
   const std::string base64_seed_signature =
       local_state_->GetString(prefs::kVariationsSeedSignature);
   const VerifySignatureResult result =
       VerifySeedSignature(seed_data, base64_seed_signature);
   if (result != VARIATIONS_SEED_SIGNATURE_ENUM_SIZE) {
     UMA_HISTOGRAM_ENUMERATION("Variations.LoadSeedSignature", result,
@@ skipping 164 matching lines @@
   return VARIATIONS_SEED_SIGNATURE_INVALID_SEED;
 }
 
 void VariationsSeedStore::ClearPrefs() {
   local_state_->ClearPref(prefs::kVariationsCompressedSeed);
   local_state_->ClearPref(prefs::kVariationsSeed);
   local_state_->ClearPref(prefs::kVariationsSeedDate);
   local_state_->ClearPref(prefs::kVariationsSeedSignature);
 }
 
+#if defined(OS_ANDROID)
+void VariationsSeedStore::ImportFirstRunJavaSeed() {
+  DVLOG(1) << "Importing first run seed from Java preferences.";
+  std::string seed_data;
+  std::string seed_signature;
+  std::string seed_country;
+  if (!get_variations_first_run_seed_.is_null()) {
+    get_variations_first_run_seed_.Run(&seed_data, &seed_signature,
+                                       &seed_country);
+  }
+
+  if (seed_data.empty()) {
+    // TODO(agulenko): add a new UMA histogram for the state of failing
+    // to import seed from Java preferences during Chrome first run.
+    return;
+  }
+
+  // TODO(agulenko): Pull actual time from the response.
+  base::Time current_time = base::Time::Now();
+
+  // TODO(agulenko): Support gzip compressed seed.
+  if (!StoreSeedData(seed_data, seed_signature, seed_country, current_time,
+                     false, false, nullptr)) {
+    LOG(WARNING) << "First run variations seed is invalid.";
+    return;
+  }
+  // TODO(agulenko): Clear Java prefs.
+}
+#endif  // OS_ANDROID
+
 bool VariationsSeedStore::ReadSeedData(std::string* seed_data) {
   std::string base64_seed_data =
       local_state_->GetString(prefs::kVariationsCompressedSeed);
   const bool is_compressed = !base64_seed_data.empty();
   // If there's no compressed seed, fall back to the uncompressed one.
   if (!is_compressed)
     base64_seed_data = local_state_->GetString(prefs::kVariationsSeed);
 
   if (base64_seed_data.empty()) {
     RecordVariationSeedEmptyHistogram(VARIATIONS_SEED_EMPTY);
@@ skipping 128 matching lines @@
   }
   return true;
 }
 
 void VariationsSeedStore::ReportUnsupportedSeedFormatError() {
   RecordSeedStoreHistogram(
       VARIATIONS_SEED_STORE_FAILED_UNSUPPORTED_SEED_FORMAT);
 }
 
 }  // namespace variations