FileVideoCaptureDevice: better error mgmt if !File.IsValid()

media/video/capture/file_video_capture_device.cc

Index: media/video/capture/file_video_capture_device.cc
diff --git a/media/video/capture/file_video_capture_device.cc b/media/video/capture/file_video_capture_device.cc
index 4e240469acf93b1b58e7f8943635849a9c430fe3..bdcc66f03f76a1802662a766bb60212f4f852970 100644
--- a/media/video/capture/file_video_capture_device.cc
+++ b/media/video/capture/file_video_capture_device.cc
@@ -124,9 +124,9 @@ int64 FileVideoCaptureDevice::ParseFileAndExtractVideoFormat(
 base::File FileVideoCaptureDevice::OpenFileForRead(
     const base::FilePath& file_path) {
   base::File file(file_path, base::File::FLAG_OPEN | base::File::FLAG_READ);
-  DVLOG_IF(1, file.IsValid()) << file_path.value() << ", error: "
-                        << base::File::ErrorToString(file.error_details());
-  CHECK(file.IsValid());
+  DLOG_IF(ERROR, file.IsValid())
+      << file_path.value()
+      << ", error: " << base::File::ErrorToString(file.error_details());
   return file.Pass();
 }
 
@@ -186,6 +186,10 @@ void FileVideoCaptureDevice::OnAllocateAndStart(
   // Open the file and parse the header. Get frame size and format.
   DCHECK(!file_.IsValid());
   file_ = OpenFileForRead(file_path_);
+  if (!file_.IsValid()) {
+    client_->OnError("Could not open Video file");
+    return;
+  }
   first_frame_byte_index_ =
       ParseFileAndExtractVideoFormat(&file_, &capture_format_);
   current_byte_index_ = first_frame_byte_index_;