win: Implement exception snapshot

client/crashpad_info.h

Index: client/crashpad_info.h
diff --git a/client/crashpad_info.h b/client/crashpad_info.h
index 57ea4eb33af9e2613fbeb1b1c84fe9a95fe1b522..0e3017deb5467fc02fbc3c2ba0893c9620a78ae9 100644
--- a/client/crashpad_info.h
+++ b/client/crashpad_info.h
@@ -99,10 +99,15 @@ struct CrashpadInfo {
   }
 
 #if defined(OS_WIN)
+  //! \brief Save the crashing thread id for the crash handler.

[Mark Mentovai, 2015/08/18 16:17:19]

Nit: ID.

[scottmg, 2015/08/18 16:56:00]

Done.

+  void set_thread_id(DWORD thread_id) { thread_id_ = thread_id; }
+  DWORD thread_id() const { return thread_id_; }
+
   //! \brief Save an EXCEPTION_POINTERS record for the crash handler.

[Mark Mentovai, 2015/08/18 16:17:19]

Nit: `EXCEPTION_POINTERS`.

[scottmg, 2015/08/18 16:56:00]

Done.

   void set_exception_pointers(EXCEPTION_POINTERS* exception_pointers) {
     exception_pointers_ = exception_pointers;
   }
+  EXCEPTION_POINTERS* exception_pointers() const { return exception_pointers_; }
 #endif  // OS_WIN
 
   enum : uint32_t {
@@ -129,6 +134,7 @@ struct CrashpadInfo {
   SimpleStringDictionary* simple_annotations_;  // weak
 
 #if defined(OS_WIN)
+  DWORD thread_id_;

[Mark Mentovai, 2015/08/18 16:17:19]

Organize for better packing: DWORDs follow pointers.

[scottmg, 2015/08/18 16:56:00]

Done.

   EXCEPTION_POINTERS* exception_pointers_;
 #endif  // OS_WIN