Added incident report for variations seed signature mismatch.

chrome/browser/metrics/variations/variations_seed_store.cc

Index: chrome/browser/metrics/variations/variations_seed_store.cc
diff --git a/chrome/browser/metrics/variations/variations_seed_store.cc b/chrome/browser/metrics/variations/variations_seed_store.cc
index be775309989c3c1b3aef14a3ec04b1df0458414e..edf7bd798e059ce52e9eeec72923ab2a0dc08a87 100644
--- a/chrome/browser/metrics/variations/variations_seed_store.cc
+++ b/chrome/browser/metrics/variations/variations_seed_store.cc
@@ -120,6 +120,7 @@ VariationsSeedStore::~VariationsSeedStore() {
 }
 
 bool VariationsSeedStore::LoadSeed(variations::VariationsSeed* seed) {
+  invalid_base64_signature_.clear();
   const std::string base64_seed_data =
       local_state_->GetString(prefs::kVariationsSeed);
   if (base64_seed_data.empty()) {
@@ -150,6 +151,8 @@ bool VariationsSeedStore::LoadSeed(variations::VariationsSeed* seed) {
               << "with result: " << result << ". Clearing the pref.";
       ClearPrefs();
       RecordVariationSeedEmptyHistogram(VARIATIONS_SEED_INVALID_SIGNATURE);
+      // Record the invalid signature.
+      invalid_base64_signature_ = base64_seed_signature;
       return false;
     }
   }
@@ -272,4 +275,8 @@ VariationsSeedStore::VerifySeedSignature(
   return VARIATIONS_SEED_SIGNATURE_INVALID_SEED;
 }
 
+std::string VariationsSeedStore::GetInvalidSignature() const {
+  return invalid_base64_signature_;
+}
+
 }  // namespace chrome_variations