Bug 1511080: Add launcher process pref and enable reflection to/from the registry; r=mhowell

Depends on D15756

Differential Revision: https://phabricator.services.mozilla.com/D15757

--HG--
extra : moz-landing-system : lando

browser/app/profile/firefox.js

@@ -1794,3 +1794,8 @@ pref("browser.engagement.recent_visited_origins.expiry", 86400); // 24 * 60 * 60
 #ifdef NIGHTLY_BUILD
 pref("browser.aboutConfig.showWarning", true);
 #endif
+
+#if defined(XP_WIN) && defined(MOZ_LAUNCHER_PROCESS)
+// Launcher process is disabled by default, will be selectively enabled via SHIELD
+pref("browser.launcherProcess.enabled", false);
+#endif // defined(XP_WIN) && defined(MOZ_LAUNCHER_PROCESS)

toolkit/xre/nsAppRunner.cpp

@@ -110,6 +110,10 @@
 #include "mozilla/mscom/MainThreadRuntime.h"
 #include "mozilla/widget/AudioSession.h"
 
+#if defined(MOZ_LAUNCHER_PROCESS)
+#include "mozilla/LauncherRegistryInfo.h"
+#endif
+
 #ifndef PROCESS_DEP_ENABLE
 #define PROCESS_DEP_ENABLE 0x1
 #endif
@@ -1628,6 +1632,38 @@ static void RegisterApplicationRestartChanged(const char* aPref, void* aData) {
     ::UnregisterApplicationRestart();
   }
 }
+
+#if defined(MOZ_LAUNCHER_PROCESS)
+
+static void OnLauncherPrefChanged(const char* aPref, void* aData) {
+  bool prefVal =
+      Preferences::GetBool(PREF_WIN_LAUNCHER_PROCESS_ENABLED, false);
+
+  mozilla::LauncherRegistryInfo launcherRegInfo;
+  mozilla::LauncherVoidResult reflectResult =
+      launcherRegInfo.ReflectPrefToRegistry(prefVal);
+  MOZ_ASSERT(reflectResult.isOk());
+}
+
+static void SetupLauncherProcessPref() {
+  mozilla::LauncherRegistryInfo launcherRegInfo;
+
+  mozilla::LauncherResult<mozilla::LauncherRegistryInfo::EnabledState>
+      enabledState = launcherRegInfo.IsEnabled();
+
+  if (enabledState.isOk()) {
+    Preferences::SetBool(
+        PREF_WIN_LAUNCHER_PROCESS_ENABLED,
+        enabledState.unwrap() !=
+            mozilla::LauncherRegistryInfo::EnabledState::ForceDisabled);
+  }
+
+  Preferences::RegisterCallback(&OnLauncherPrefChanged,
+                                PREF_WIN_LAUNCHER_PROCESS_ENABLED);
+}
+
+#endif  // defined(MOZ_LAUNCHER_PROCESS)
+
 #endif  // XP_WIN
 
 // If aBlankCommandLine is true, then the application will be launched with a
@@ -4230,6 +4266,9 @@ nsresult XREMain::XRE_mainRun() {
 #ifdef XP_WIN
     Preferences::RegisterCallbackAndCall(RegisterApplicationRestartChanged,
                                          PREF_WIN_REGISTER_APPLICATION_RESTART);
+#if defined(MOZ_LAUNCHER_PROCESS)
+    SetupLauncherProcessPref();
+#endif  // defined(MOZ_LAUNCHER_PROCESS)
 #endif
 
 #if defined(HAVE_DESKTOP_STARTUP_ID) && defined(MOZ_WIDGET_GTK)

toolkit/xre/nsAppRunner.h

@@ -102,6 +102,10 @@ BOOL WinLaunchChild(const wchar_t* exePath, int argc, char** argv,
 
 #define PREF_WIN_REGISTER_APPLICATION_RESTART \
   "toolkit.winRegisterApplicationRestart"
+
+#if defined(MOZ_LAUNCHER_PROCESS)
+#define PREF_WIN_LAUNCHER_PROCESS_ENABLED "browser.launcherProcess.enabled"
+#endif  // defined(MOZ_LAUNCHER_PROCESS)
 #endif
 
 namespace mozilla {