Bug 1197673 - Use float type for SetAudioOutputVolume. r=eitan

dom/media/webspeech/synth/ipc/PSpeechSynthesisRequest.ipdl

@@ -23,7 +23,7 @@ async protocol PSpeechSynthesisRequest
 
   ForceEnd();
 
-  SetAudioOutputVolume(uint32_t aVolume);
+  SetAudioOutputVolume(float aVolume);
 
  child:
 

dom/media/webspeech/synth/ipc/SpeechSynthesisChild.cpp

@@ -192,7 +192,7 @@ SpeechTaskChild::ForceEnd()
 }
 
 void
-SpeechTaskChild::SetAudioOutputVolume(uint32_t aVolume)
+SpeechTaskChild::SetAudioOutputVolume(float aVolume)
 {
   if (mActor) {
     mActor->SendSetAudioOutputVolume(aVolume);

dom/media/webspeech/synth/ipc/SpeechSynthesisChild.h

@@ -92,7 +92,7 @@ public:
 
   virtual void ForceEnd() override;
 
-  virtual void SetAudioOutputVolume(uint32_t aVolume) override;
+  virtual void SetAudioOutputVolume(float aVolume) override;
 
 private:
   SpeechSynthesisRequestChild* mActor;

dom/media/webspeech/synth/ipc/SpeechSynthesisParent.cpp

@@ -128,7 +128,7 @@ SpeechSynthesisRequestParent::RecvForceEnd()
 }
 
 bool
-SpeechSynthesisRequestParent::RecvSetAudioOutputVolume(const uint32_t& aVolume)
+SpeechSynthesisRequestParent::RecvSetAudioOutputVolume(const float& aVolume)
 {
   MOZ_ASSERT(mTask);
   mTask->SetAudioOutputVolume(aVolume);

dom/media/webspeech/synth/ipc/SpeechSynthesisParent.h

@@ -70,7 +70,7 @@ protected:
 
   virtual bool RecvForceEnd() override;
 
-  virtual bool RecvSetAudioOutputVolume(const uint32_t& aVolume) override;
+  virtual bool RecvSetAudioOutputVolume(const float& aVolume) override;
 };
 
 class SpeechTaskParent : public nsSpeechTask

dom/media/webspeech/synth/nsSpeechTask.cpp

@@ -685,7 +685,7 @@ nsSpeechTask::DestroyAudioChannelAgent()
 NS_IMETHODIMP
 nsSpeechTask::WindowVolumeChanged(float aVolume, bool aMuted)
 {
-  SetAudioOutputVolume(mVolume * aVolume * aMuted);
+  SetAudioOutputVolume(aMuted ? 0.0 : mVolume * aVolume);
   return NS_OK;
 }
 
@@ -697,7 +697,7 @@ nsSpeechTask::WindowAudioCaptureChanged()
 }
 
 void
-nsSpeechTask::SetAudioOutputVolume(uint32_t aVolume)
+nsSpeechTask::SetAudioOutputVolume(float aVolume)
 {
   if (mStream) {
     mStream->SetAudioOutputVolume(this, aVolume);

dom/media/webspeech/synth/nsSpeechTask.h

@@ -52,7 +52,7 @@ public:
 
   void SetChosenVoiceURI(const nsAString& aUri);
 
-  virtual void SetAudioOutputVolume(uint32_t aVolume);
+  virtual void SetAudioOutputVolume(float aVolume);
 
   bool IsPreCanceled()
   {