win: Implement exception snapshot

snapshot/win/process_snapshot_win.h

Index: snapshot/win/process_snapshot_win.h
diff --git a/snapshot/win/process_snapshot_win.h b/snapshot/win/process_snapshot_win.h
index 97bb1c697033feaada78960683ec11733c053af3..9e668ef9c527e32ffe00660ff1c35f7eb0990442 100644
--- a/snapshot/win/process_snapshot_win.h
+++ b/snapshot/win/process_snapshot_win.h
@@ -31,11 +31,13 @@
 #include "snapshot/process_snapshot.h"
 #include "snapshot/system_snapshot.h"
 #include "snapshot/thread_snapshot.h"
+#include "snapshot/win/exception_snapshot_win.h"
 #include "snapshot/win/module_snapshot_win.h"
 #include "snapshot/win/system_snapshot_win.h"
 #include "snapshot/win/thread_snapshot_win.h"
 #include "util/misc/initialization_state_dcheck.h"
 #include "util/misc/uuid.h"
+#include "util/win/address_types.h"
 #include "util/stdlib/pointer_container.h"
 
 namespace crashpad {
@@ -55,6 +57,20 @@ class ProcessSnapshotWin final : public ProcessSnapshot {
   //!     an appropriate message logged.
   bool Initialize(HANDLE process);
 
+  //! \brief Initializes the object's exception.
+  //!
+  //! This populates the data to be returned by Exception(). The parameters may
+  //! be passed directly through from a Windows exception handler.
+  //!
+  //! This method must not be called until after a successful call to
+  //! Initialize().
+  //!
+  //! \return `true` if the exception information could be initialized, `false`
+  //!     otherwise with an appropriate message logged. When this method returns
+  //!     `false`, the ProcessSnapshotWin object's validity remains unchanged.
+  bool InitializeException(DWORD thread_id,
+                           WinVMAddress exception_pointers);
+
   //! \brief Sets the value to be returned by ReportID().
   //!
   //! The crash report ID is under the control of the snapshot producer, which
@@ -113,7 +129,7 @@ class ProcessSnapshotWin final : public ProcessSnapshot {
   internal::SystemSnapshotWin system_;
   PointerVector<internal::ThreadSnapshotWin> threads_;
   PointerVector<internal::ModuleSnapshotWin> modules_;
-  // TODO(scottmg): scoped_ptr<internal::ExceptionSnapshotWin> exception_;
+  scoped_ptr<internal::ExceptionSnapshotWin> exception_;
   ProcessReaderWin process_reader_;
   UUID report_id_;
   UUID client_id_;