Change minimum DTMF event duration to be 40 milliseconds

webrtc/pc/dtmfsender_unittest.cc

Index: webrtc/pc/dtmfsender_unittest.cc
diff --git a/webrtc/pc/dtmfsender_unittest.cc b/webrtc/pc/dtmfsender_unittest.cc
index 109760c3824a4a976adadfe62dc6a3d935ef9f36..9aab03bcc39026c8931fe8abe2b0cc6a3e5e7de4 100644
--- a/webrtc/pc/dtmfsender_unittest.cc
+++ b/webrtc/pc/dtmfsender_unittest.cc
@@ -334,7 +334,7 @@ TEST_F(DtmfSenderTest, InsertDtmfWithInvalidDurationOrGap) {
   int inter_tone_gap = 50;
 
   EXPECT_FALSE(dtmf_->InsertDtmf(tones, 6001, inter_tone_gap));
-  EXPECT_FALSE(dtmf_->InsertDtmf(tones, 69, inter_tone_gap));
+  EXPECT_FALSE(dtmf_->InsertDtmf(tones, 39, inter_tone_gap));

[Taylor Brandstetter, 2017/02/16 18:18:23]

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

   EXPECT_FALSE(dtmf_->InsertDtmf(tones, duration, 49));
 
   EXPECT_TRUE(dtmf_->InsertDtmf(tones, duration, inter_tone_gap));