Track execution phase of browser process when we log if the broswer has

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index 4c3c55a330e3b2851381770f874796130bca0b99..35eea97bcd8ee48780c3429484857ab8b7f60f96 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1360,6 +1360,10 @@ const char kVariationsSeedDate[] = "variations_seed_date";
 // SHA-1 hash of the serialized variations seed data.
 const char kVariationsSeedHash[] = "variations_seed_hash";
 
+// An enum value to indicate the execution phase the browser was in.
+const char kStabilityExecutionPhase[] =
+    "user_experience_metrics.stability.execution_phase";
+
 // True if the previous run of the program exited cleanly.
 const char kStabilityExitedCleanly[] =
     "user_experience_metrics.stability.exited_cleanly";