Bug 1559675 - P2. Initialise xpcom earlier in GPU process. r=mattwoodrow

StaticPrefs are fully initialized with Preferences, which is instantiated via XPCOM. It is required as such to initialize xpcom first.

Depends on D35263

Differential Revision: https://phabricator.services.mozilla.com/D35264

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

gfx/ipc/GPUParent.cpp

@@ -107,6 +107,10 @@ bool GPUParent::Init(base::ProcessId aParentPid, const char* aParentBuildID,
     ProcessChild::QuickExit();
   }
 
+  if (NS_FAILED(NS_InitMinimalXPCOM())) {
+    return false;
+  }
+
   // Init crash reporter support.
   CrashReporterClient::InitSingleton(this);
 
@@ -120,10 +124,6 @@ bool GPUParent::Init(base::ProcessId aParentPid, const char* aParentBuildID,
   DeviceManagerDx::Init();
 #endif
 
-  if (NS_FAILED(NS_InitMinimalXPCOM())) {
-    return false;
-  }
-
   CompositorThreadHolder::Start();
   APZThreadUtils::SetControllerThread(MessageLoop::current());
   apz::InitializeGlobalState();