Drop pending output pictures on DXVA::Reset().

BUG=139308


Review URL: https://chromiumcodereview.appspot.com/10827095

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@149114 0039d316-1c4b-4281-b951-d872f2087c98

content/common/gpu/media/dxva_video_decode_accelerator.cc

@@ -679,6 +679,8 @@ void DXVAVideoDecodeAccelerator::Reset() {
 
   state_ = kResetting;
 
+  pending_output_samples_.clear();
+
   RETURN_AND_NOTIFY_ON_FAILURE(SendMFTMessage(MFT_MESSAGE_COMMAND_FLUSH, 0),
       "Reset: Failed to send message.", PLATFORM_FAILURE,);