Allow option for efficient and safe opt out of in-proc dump generation for Windows breakpad clients.

https://breakpad.appspot.com/549002/



git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1157 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/client/windows/crash_generation/crash_generation_client.cc

@@ -178,6 +178,10 @@ CrashGenerationClient::~CrashGenerationClient() {
 //
 // Returns true if the registration is successful; false otherwise.
 bool CrashGenerationClient::Register() {
+  if (IsRegistered()) {
+    return true;
+  }
+
   HANDLE pipe = ConnectToServer();
   if (!pipe) {
     return false;