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 e5ddce9b843c819e19e27014a0922e9e78ecc1c6..166a13df213ba18e27c5b895c40dd31f932cb6e6 100644
--- a/chrome/app/chrome_crash_reporter_client_win.cc
+++ b/chrome/app/chrome_crash_reporter_client_win.cc
@@ -181,6 +181,10 @@ 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