Change minimum DTMF event duration to be 40 milliseconds

webrtc/media/engine/webrtcvoiceengine_unittest.cc

Index: webrtc/media/engine/webrtcvoiceengine_unittest.cc
diff --git a/webrtc/media/engine/webrtcvoiceengine_unittest.cc b/webrtc/media/engine/webrtcvoiceengine_unittest.cc
index 612d5c2e6b0fb27eef815b91f8c7272c767877d2..40ed66ad9c63f2f3a6b7354a50f19153ed439cae 100644
--- a/webrtc/media/engine/webrtcvoiceengine_unittest.cc
+++ b/webrtc/media/engine/webrtcvoiceengine_unittest.cc
@@ -253,6 +253,9 @@ class WebRtcVoiceEngineTestFake : public testing::Test {
     // Check we fail if the ssrc is invalid.
     EXPECT_FALSE(channel_->InsertDtmf(-1, 1, 111));
 
+    // Check that we fail if we specify a too short duration

[Taylor Brandstetter, 2017/02/16 18:18:22]

nit: Period at end of comment, "duration that's too short"

+    EXPECT_FALSE(channel_->InsertDtmf(ssrc, 2, 39));

[Taylor Brandstetter, 2017/02/16 18:18:22]

There should also be a test somewhere that "InsertDtmf" with a duration of
exactly 40 works.

+
     // Test send.
     cricket::FakeAudioSendStream::TelephoneEvent telephone_event =
         GetSendStream(kSsrc1).GetLatestTelephoneEvent();