Added a death test for the pure virtual function call....

src/client/windows/handler/exception_handler.cc

Index: src/client/windows/handler/exception_handler.cc
===================================================================
--- src/client/windows/handler/exception_handler.cc	(revision 596)
+++ src/client/windows/handler/exception_handler.cc	(working copy)
@@ -550,6 +550,8 @@
 
 // static
 void ExceptionHandler::HandlePureVirtualCall() {
+  // This is an pure virtual funciton call, not an exception.  It's safe to
+  // play with sprintf here.
   AutoExceptionHandler auto_exception_handler;
   ExceptionHandler* current_handler = auto_exception_handler.get_handler();
 
@@ -557,6 +559,26 @@
   memset(&assertion, 0, sizeof(assertion));
   assertion.type = MD_ASSERTION_INFO_TYPE_PURE_VIRTUAL_CALL;
 
+  // Make up an exception record for the current thread and CPU context
+  // to make it possible for the crash processor to classify these
+  // as do regular crashes, and to make it humane for developers to
+  // analyze them.
+  EXCEPTION_RECORD exception_record = {};
+  CONTEXT exception_context = {};
+  EXCEPTION_POINTERS exception_ptrs = { &exception_record, &exception_context };
+  RtlCaptureContext(&exception_context);
+  exception_record.ExceptionCode = STATUS_NONCONTINUABLE_EXCEPTION;
+
+  // We store pointers to the the expression and function strings,
+  // and the line as exception parameters to make them easy to
+  // access by the developer on the far side.
+  exception_record.NumberParameters = 3;
+  exception_record.ExceptionInformation[0] =
+      reinterpret_cast<ULONG_PTR>(&assertion.expression);
+  exception_record.ExceptionInformation[1] =
+      reinterpret_cast<ULONG_PTR>(&assertion.file);
+  exception_record.ExceptionInformation[2] = assertion.line;
+
   bool success = false;
   // In case of out-of-process dump generation, directly call
   // WriteMinidumpWithException since there is no separate thread running.
@@ -564,10 +586,11 @@
   if (current_handler->IsOutOfProcess()) {
     success = current_handler->WriteMinidumpWithException(
         GetCurrentThreadId(),
-        NULL,
+        &exception_ptrs,
         &assertion);
   } else {
-    success = current_handler->WriteMinidumpOnHandlerThread(NULL, &assertion);
+    success = current_handler->WriteMinidumpOnHandlerThread(&exception_ptrs,
+                                                            &assertion);
   }
 
   if (!success) {