upstream cl/337571894 with tweaks

Seems harmless to fall back to other SetupCrashHandler() options.

Change-Id: I2e7ce5dd72f391af88a57f4bd29831122fe784b9
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/327893
Reviewed-by: Peter Foley <pefoley@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>

tools/CrashHandler.cpp

@@ -12,6 +12,10 @@
 #include <stdlib.h>
 
 #if defined(SK_BUILD_FOR_GOOGLE3)
+    #include "base/config.h"   // May define GOOGLE_ENABLE_SIGNAL_HANDLERS.
+#endif
+
+#if defined(GOOGLE_ENABLE_SIGNAL_HANDLERS)
     #include "base/process_state.h"
     void SetupCrashHandler() { InstallSignalHandlers(); }