Allow the crash generation server to be initialized with a handle instead of a pipe name.

src/client/windows/handler/exception_handler.h

Index: src/client/windows/handler/exception_handler.h
===================================================================
--- src/client/windows/handler/exception_handler.h	(revision 972)
+++ src/client/windows/handler/exception_handler.h	(working copy)
@@ -153,7 +153,7 @@
                    void* callback_context,
                    int handler_types);
 
-  // Creates a new ExcetpionHandler instance that can attempt to perform
+  // Creates a new ExceptionHandler instance that can attempt to perform
   // out-of-process dump generation if pipe_name is not NULL. If pipe_name is
   // NULL, or if out-of-process dump generation registration step fails,
   // in-process dump generation will be used. This also allows specifying
@@ -167,6 +167,17 @@
                    const wchar_t* pipe_name,
                    const CustomClientInfo* custom_info);
 
+  // As above, creates a new ExceptionHandler instance to perform
+  // out-of-process dump generation if the given pipe_handle is not NULL.
+  ExceptionHandler(const wstring& dump_path,
+                   FilterCallback filter,
+                   MinidumpCallback callback,
+                   void* callback_context,
+                   int handler_types,
+                   MINIDUMP_TYPE dump_type,
+                   HANDLE pipe_handle,
+                   const CustomClientInfo* custom_info);
+
   ~ExceptionHandler();
 
   // Get and set the minidump path.
@@ -219,6 +230,7 @@
                   int handler_types,
                   MINIDUMP_TYPE dump_type,
                   const wchar_t* pipe_name,
+                  HANDLE pipe_handle,
                   const CustomClientInfo* custom_info);
 
   // Function pointer type for MiniDumpWriteDump, which is looked up