Bug 1080863 - Make nsPicoService an observer and initialize on profile-after-change. r=smaug

content/media/webspeech/synth/pico/nsPicoService.cpp

@@ -411,7 +411,8 @@ PicoCallbackRunnable::OnCancel()
 
 NS_INTERFACE_MAP_BEGIN(nsPicoService)
   NS_INTERFACE_MAP_ENTRY(nsISpeechService)
-  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsISpeechService)
+  NS_INTERFACE_MAP_ENTRY(nsIObserver)
+  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIObserver)
 NS_INTERFACE_MAP_END
 
 NS_IMPL_ADDREF(nsPicoService)
@@ -427,10 +428,6 @@ nsPicoService::nsPicoService()
   , mTaResource(nullptr)
   , mPicoMemArea(nullptr)
 {
-  DebugOnly<nsresult> rv = NS_NewNamedThread("Pico Worker", getter_AddRefs(mThread));
-  MOZ_ASSERT(NS_SUCCEEDED(rv));
-  rv = mThread->Dispatch(NS_NewRunnableMethod(this, &nsPicoService::Init), NS_DISPATCH_NORMAL);
-  MOZ_ASSERT(NS_SUCCEEDED(rv));
 }
 
 nsPicoService::~nsPicoService()
@@ -447,6 +444,20 @@ nsPicoService::~nsPicoService()
   UnloadEngine();
 }
 
+// nsIObserver
+
+NS_IMETHODIMP
+nsPicoService::Observe(nsISupports* aSubject, const char* aTopic,
+                       const char16_t* aData)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  NS_ENSURE_TRUE(!strcmp(aTopic, "profile-after-change"), NS_ERROR_UNEXPECTED);
+
+  DebugOnly<nsresult> rv = NS_NewNamedThread("Pico Worker", getter_AddRefs(mThread));
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+  return mThread->Dispatch(
+    NS_NewRunnableMethod(this, &nsPicoService::Init), NS_DISPATCH_NORMAL);
+}
 // nsISpeechService
 
 NS_IMETHODIMP

content/media/webspeech/synth/pico/nsPicoService.h

@@ -10,6 +10,7 @@
 #include "mozilla/Mutex.h"
 #include "nsAutoPtr.h"
 #include "nsTArray.h"
+#include "nsIObserver.h"
 #include "nsIThread.h"
 #include "nsISpeechService.h"
 #include "nsRefPtrHashtable.h"
@@ -26,7 +27,8 @@ typedef void* pico_System;
 typedef void* pico_Resource;
 typedef void* pico_Engine;
 
-class nsPicoService : public nsISpeechService
+class nsPicoService : public nsIObserver,
+                      public nsISpeechService
 {
   friend class PicoCallbackRunnable;
   friend class PicoInitRunnable;
@@ -34,6 +36,7 @@ class nsPicoService : public nsISpeechService
 public:
   NS_DECL_THREADSAFE_ISUPPORTS
   NS_DECL_NSISPEECHSERVICE
+  NS_DECL_NSIOBSERVER
 
   nsPicoService();