Add default case in AddCrashKey

This allows to avoid build breaks when new ids are added on v8's side.

Bug: chromium:1010312
Change-Id: Ia375cc842137e4b58f801e0fcc63d2222b0cf482
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1841933Reviewed-by: Stefan Zager <szager@chromium.org>
Commit-Queue: Irina Yatsenko <irinayat@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#703494}

content/renderer/render_thread_impl.cc

@@ -304,6 +304,10 @@ void AddCrashKey(v8::CrashKeyId id, const std::string& value) {
                                      bd::CrashKeySize::Size32);
       bd::SetCrashKeyString(code_space_firstpage_address, value);
       break;
+    default:
+      // Doing nothing for new keys is a valid option. Having this case allows
+      // to introduce new CrashKeyId's without triggering a build break.
+      break;
   }
 }