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..f50871a053b06e784c3eb6e3d534d0e8ea70e45b 100644
--- a/chrome/browser/metrics/variations/variations_seed_store.cc
+++ b/chrome/browser/metrics/variations/variations_seed_store.cc
@@ -113,13 +113,15 @@ VariationsSeedDateChangeState GetSeedDateChangeState(
 }  // namespace
 
 VariationsSeedStore::VariationsSeedStore(PrefService* local_state)
-    : local_state_(local_state) {
+    : is_invalid_signature_(false), local_state_(local_state) {
 }
 
 VariationsSeedStore::~VariationsSeedStore() {
 }
 
 bool VariationsSeedStore::LoadSeed(variations::VariationsSeed* seed) {
+  invalid_signature_.clear();
+  is_invalid_signature_ = false;
   const std::string base64_seed_data =
       local_state_->GetString(prefs::kVariationsSeed);
   if (base64_seed_data.empty()) {
@@ -150,6 +152,9 @@ bool VariationsSeedStore::LoadSeed(variations::VariationsSeed* seed) {
               << "with result: " << result << ". Clearing the pref.";
       ClearPrefs();
       RecordVariationSeedEmptyHistogram(VARIATIONS_SEED_INVALID_SIGNATURE);
+      // Record the invalid signature.
+      is_invalid_signature_ = true;
+      invalid_signature_ = base64_seed_signature;
       return false;
     }
   }
@@ -272,4 +277,13 @@ VariationsSeedStore::VerifySeedSignature(
   return VARIATIONS_SEED_SIGNATURE_INVALID_SEED;
 }
 
+bool VariationsSeedStore::GetInvalidSignature(
+    std::string* invalid_signature) const {
+  if (!is_invalid_signature_) {

[Alexei Svitkine (slow), 2014/10/14 17:30:01]

Nit: No need for {}'s if body is a single line.

[Georges Khalil, 2014/10/14 18:00:32]

Done.

+    return false;
+  }
+  *invalid_signature = invalid_signature_;
+  return true;
+}
+
 }  // namespace chrome_variations