Work around NOTREACHED crash.

This doesn't actually fix anything, but logs a message instead of crashing.

Bug: 805864
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: If377b859a173b79cd30d01fb71624d376a50902e
Reviewed-on: https://chromium-review.googlesource.com/887578
Commit-Queue: Fredrik Hubinette <hubbe@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534586}

media/gpu/dxva_video_decode_accelerator_win.cc

@@ -199,7 +199,6 @@ uint64_t GetCurrentQPC() {
 }
 
 uint64_t g_last_process_output_time;
-HRESULT g_last_unhandled_error;
 HRESULT g_last_device_removed_reason;
 
 }  // namespace
@@ -1925,9 +1924,10 @@ void DXVAVideoDecodeAccelerator::DoDecode(const gfx::ColorSpace& color_space) {
         SetState(kStopped);
         return;
       } else {
-        NOTREACHED() << "Unhandled error in DoDecode()";
-        g_last_unhandled_error = hr;
-        return;
+        // Unknown error, stop playback and log error.
+        SetState(kStopped);
+        RETURN_AND_NOTIFY_ON_FAILURE(hr, "Unhandled error in DoDecode()",
+                                     PLATFORM_FAILURE, );
       }
     }