Add the ability to defer the initialization of the SyzyAsan crash reporter.

syzygy/agent/asan/reporters/crashpad_reporter.cc

Index: syzygy/agent/asan/reporters/crashpad_reporter.cc
diff --git a/syzygy/agent/asan/reporters/crashpad_reporter.cc b/syzygy/agent/asan/reporters/crashpad_reporter.cc
index f0f05bfc328debcd3487b29e1d56b7302838fd14..39356700cabbb1efd3bb2b9b703f817701a9b809 100644
--- a/syzygy/agent/asan/reporters/crashpad_reporter.cc
+++ b/syzygy/agent/asan/reporters/crashpad_reporter.cc
@@ -49,13 +49,17 @@ bool EnsureCrashpadConnected() {
   // Only initialize once.
   if (initialized)
     return crashpad_present;
-  initialized = true;
 
   // Get the name of the crashpad endpoint, failing if none exists.
   std::unique_ptr<base::Environment> env(base::Environment::Create());
   std::string pipe_name;
   if (!env->GetVar(kCrashpadPipeNameVar, &pipe_name))
     return false;
+
+  // Only flip the initialization bit once we've been able to read the
+  // environment variable to make this work if Crashpad wasn't present
+  // during the process initialization but is here later.
+  initialized = true;
   std::wstring pipe_name_w = base::UTF8ToWide(pipe_name);
 
   // Initialize the crashpad client.