Define crash keys in the directory hierarchy where they are used.

components/crash/core/common/crash_keys.cc

Index: components/crash/core/common/crash_keys.cc
diff --git a/components/crash/core/common/crash_keys.cc b/components/crash/core/common/crash_keys.cc
index 6c2d3828deee3ad3c6096a0f31431d026c476275..e42fa3f42c823f4764854a4eb992f8b6fa551989 100644
--- a/components/crash/core/common/crash_keys.cc
+++ b/components/crash/core/common/crash_keys.cc
@@ -134,6 +134,28 @@ void GetCrashKeysForCommandLineSwitches(
   }
 }
 
+void AppendCrashCrashKeys(std::vector<base::debug::CrashKey>* keys) {
+  DCHECK(keys);
+
+  const std::vector<base::debug::CrashKey> crash_keys = {
+#if defined(OS_MACOSX) || defined(OS_WIN)
+    { kMetricsClientId, kSmallSize },
+#else
+    { kClientId, kSmallSize },
+#endif
+    { kChannel, kSmallSize },
+    { kNumVariations, kSmallSize },
+    { kVariations, kLargeSize },
+#if defined(OS_MACOSX)
+    { mac::kZombie, kMediumSize },
+    { mac::kZombieTrace, kMediumSize },
+#endif
+    { kBug464926CrashKey, kSmallSize },
+  };
+
+  keys->insert(keys->end(), crash_keys.begin(), crash_keys.end());
+}
+
 void SetSwitchesFromCommandLine(const base::CommandLine& command_line,
                                 SwitchFilterFunction skip_filter) {
   const base::CommandLine::StringVector& argv = command_line.argv();