Have the mock PlatformSpeechSynthesizer ignore pause/resume sometimes.

third_party/WebKit/Source/modules/speech/testing/PlatformSpeechSynthesizerMock.cpp

Index: third_party/WebKit/Source/modules/speech/testing/PlatformSpeechSynthesizerMock.cpp
diff --git a/third_party/WebKit/Source/modules/speech/testing/PlatformSpeechSynthesizerMock.cpp b/third_party/WebKit/Source/modules/speech/testing/PlatformSpeechSynthesizerMock.cpp
index 956b8601070ef732b858a642ec384566d2137526..6722528048a346b2d73681ea1793e617d0aba3db 100644
--- a/third_party/WebKit/Source/modules/speech/testing/PlatformSpeechSynthesizerMock.cpp
+++ b/third_party/WebKit/Source/modules/speech/testing/PlatformSpeechSynthesizerMock.cpp
@@ -121,11 +121,17 @@ void PlatformSpeechSynthesizerMock::cancel()
 
 void PlatformSpeechSynthesizerMock::pause()
 {
+    if (!m_currentUtterance)
+        return;
+
     client()->didPauseSpeaking(m_currentUtterance);
 }
 
 void PlatformSpeechSynthesizerMock::resume()
 {
+    if (!m_currentUtterance)
+        return;
+
     client()->didResumeSpeaking(m_currentUtterance);
 }