Merge pull request #467 from RecordReplay/kannan/implement-get-dispatch-server-in-cpp

Implement getDispatchServer in C++ for process prealloc.

Author: kannanvijayan

dom/ipc/ContentParent.cpp

@@ -650,8 +650,10 @@ static const char* sObserverTopics[] = {
 // PreallocateProcess is called by the PreallocatedProcessManager.
 // ContentParent then takes this process back within GetNewOrUsedBrowserProcess.
 /*static*/ RefPtr<ContentParent::LaunchPromise>
-ContentParent::PreallocateProcess() {
-  RefPtr<ContentParent> process = new ContentParent(PREALLOC_REMOTE_TYPE, nsString());
+ContentParent::PreallocateProcess(const nsAString& aRecordingDispatchAddress) {
+  RefPtr<ContentParent> process = new ContentParent(
+    PREALLOC_REMOTE_TYPE,
+    aRecordingDispatchAddress);
 
   MOZ_LOG(ContentParent::GetLog(), LogLevel::Debug,
           ("Preallocating process of type prealloc"));

dom/ipc/ContentParent.h

@@ -152,7 +152,8 @@ class ContentParent final
   /**
    * Create a subprocess suitable for use later as a content process.
    */
-  static RefPtr<LaunchPromise> PreallocateProcess();
+  static RefPtr<LaunchPromise> PreallocateProcess(
+    const nsAString& aRecordingDispatchAddress = nsString());
 
   /**
    * Start up the content-process machinery.  This might include

dom/ipc/PreallocatedProcessManager.cpp

@@ -47,6 +47,8 @@ class PreallocatedProcessManagerImpl final : public nsIObserver {
 
   static StaticRefPtr<PreallocatedProcessManagerImpl> sSingleton;
 
+  static nsresult GetReplayDispatchServer(nsAString& dispatchServer);
+
   PreallocatedProcessManagerImpl();
   ~PreallocatedProcessManagerImpl();
   PreallocatedProcessManagerImpl(const PreallocatedProcessManagerImpl&) =
@@ -119,6 +121,15 @@ PreallocatedProcessManagerImpl::~PreallocatedProcessManagerImpl() {
   MOZ_RELEASE_ASSERT(!mLaunchInProgress);
 }
 
+nsresult PreallocatedProcessManagerImpl::GetReplayDispatchServer(nsAString& addr) {
+  const char* envAddr = getenv("RECORD_REPLAY_SERVER");
+  if (envAddr) {
+    CopyUTF8toUTF16(mozilla::Span(envAddr, strlen(envAddr)), addr);
+    return NS_OK;
+  }
+  return Preferences::GetString("devtools.recordreplay.cloudServer", addr);
+}
+
 void PreallocatedProcessManagerImpl::Init() {
   Preferences::AddStrongObserver(this, "dom.ipc.processPrelaunch.enabled");
   // We have to respect processCount at all time. This is especially important