Add crash keys about field trial shared memory errors.

chrome/app/chrome_crash_reporter_client_win.cc

Index: chrome/app/chrome_crash_reporter_client_win.cc
diff --git a/chrome/app/chrome_crash_reporter_client_win.cc b/chrome/app/chrome_crash_reporter_client_win.cc
index a0343abb2c7e9454c36e1cd1872af0f112224482..79ff36485faf726165ea8285dbef2597a8752273 100644
--- a/chrome/app/chrome_crash_reporter_client_win.cc
+++ b/chrome/app/chrome_crash_reporter_client_win.cc
@@ -202,6 +202,10 @@ size_t RegisterCrashKeysHelper() {
       {"engine_params", crash_keys::kMediumSize},
       {"engine1_params", crash_keys::kMediumSize},
       {"engine2_params", crash_keys::kMediumSize},
+
+      // Temporary for http://crbug.com/703649.
+      {"field_trial_shmem_create_error", crash_keys::kSmallSize},
+      {"field_trial_shmem_map_error", crash_keys::kSmallSize},
   };
 
   // This dynamic set of keys is used for sets of key value pairs when gathering