for streaming sample should have "stream=" param
for streaming sample should have "stream=" param

Sample class can take in content, source_uri or stream, should be stream here.
```
    :type content: bytes
    :param content: (Optional) Bytes containing audio data.

    :type stream: file
    :param stream: (Optional) File like object to stream.
```
the type is deduced using:
```sources = [content is not None, source_uri is not None, stream is not None]```
calpeyser/google-cloud-python,tseaver/google-cloud-python,tswast/google-cloud-python,googleapis/google-cloud-python,tseaver/gcloud-python,daspecster/google-cloud-python,dhermes/google-cloud-python,jonparrott/google-cloud-python,tswast/google-cloud-python,tseaver/gcloud-python,googleapis/google-cloud-python,tartavull/google-cloud-python,jonparrott/gcloud-python,GoogleCloudPlatform/gcloud-python,tseaver/google-cloud-python,tswast/google-cloud-python,daspecster/google-cloud-python,tartavull/google-cloud-python,jonparrott/google-cloud-python,tseaver/google-cloud-python,GoogleCloudPlatform/gcloud-python,dhermes/google-cloud-python,jonparrott/gcloud-python,calpeyser/google-cloud-python,dhermes/gcloud-python,dhermes/google-cloud-python,dhermes/gcloud-python