Add crash annotations before handling device resets. (bug 1363126 part 4, r=milan)

gfx/thebes/DeviceManagerDx.cpp

@@ -16,7 +16,9 @@
 #include "mozilla/gfx/Logging.h"
 #include "mozilla/layers/CompositorThread.h"
 #include "mozilla/layers/DeviceAttachmentsD3D11.h"
+#include "nsExceptionHandler.h"
 #include "nsIGfxInfo.h"
+#include "nsPrintfCString.h"
 #include <d3d11.h>
 #include <ddraw.h>
 
@@ -628,6 +630,13 @@ DeviceManagerDx::MaybeResetAndReacquireDevices()
     Telemetry::Accumulate(Telemetry::DEVICE_RESET_REASON, uint32_t(resetReason));
   }
 
+#ifdef MOZ_CRASHREPORTER
+  nsPrintfCString reasonString("%d", int(resetReason));
+  CrashReporter::AnnotateCrashReport(
+    NS_LITERAL_CSTRING("DeviceResetReason"),
+    reasonString);
+#endif
+
   bool createCompositorDevice = !!mCompositorDevice;
   bool createContentDevice = !!mContentDevice;