upstream hooking into google3 crash handler for better stacktraces

tools/CrashHandler.cpp

 #include "CrashHandler.h"
 
 #include "SkTypes.h"
 
 #include <stdlib.h>
 
 // Disable SetupCrashHandler() unless SK_CRASH_HANDLER is defined.
 #ifndef SK_CRASH_HANDLER
     void SetupCrashHandler() { }
 
+#elif defined(GOOGLE3)
+    #include "base/process_state.h"
+    void SetupCrashHandler() { InstallSignalHandlers(); }
+
 #else
 
     #if defined(SK_BUILD_FOR_MAC)
 
         // We only use local unwinding, so we can define this to select a faster implementation.
         #define UNW_LOCAL_ONLY
         #include <libunwind.h>
         #include <cxxabi.h>
 
         static void handler(int sig) {
@@ skipping 151 matching lines @@
         void SetupCrashHandler() {
             SetUnhandledExceptionFilter(handler);
         }
 
     #else  // We asked for SK_CRASH_HANDLER, but it's not Mac, Linux, or Windows.  Sorry!
 
         void SetupCrashHandler() { }
 
     #endif
 #endif // SK_CRASH_HANDLER