Add virtual Initialize() to PerfQueryBase

Both DX12 and Vulkan already had one.

Source/Core/VideoBackends/D3D12/D3D12PerfQuery.h

@@ -17,7 +17,7 @@ public:
 
   static PerfQuery* GetInstance() { return static_cast<PerfQuery*>(g_perf_query.get()); }
 
-  bool Initialize();
+  bool Initialize() override;
   void ResolveQueries();
 
   void EnableQuery(PerfQueryGroup group) override;

Source/Core/VideoBackends/Vulkan/VKMain.cpp

@@ -239,19 +239,8 @@ bool VideoBackend::Initialize(const WindowSystemInfo& wsi)
   auto perf_query = std::make_unique<PerfQuery>();
   auto bounding_box = std::make_unique<VKBoundingBox>();
 
-  if (!InitializeShared(std::move(gfx), std::move(vertex_manager), std::move(perf_query),
-                        std::move(bounding_box)))
-  {
-    return false;
-  }
-
-  if (!PerfQuery::GetInstance()->Initialize())
-  {
-    PanicAlertFmt("Failed to initialize PerfQuery");
-    return false;
-  }
-
-  return true;
+  return !InitializeShared(std::move(gfx), std::move(vertex_manager), std::move(perf_query),
+                           std::move(bounding_box));
 }
 
 void VideoBackend::Shutdown()

Source/Core/VideoBackends/Vulkan/VKPerfQuery.h

@@ -20,7 +20,7 @@ public:
 
   static PerfQuery* GetInstance() { return static_cast<PerfQuery*>(g_perf_query.get()); }
 
-  bool Initialize();
+  bool Initialize() override;
 
   void EnableQuery(PerfQueryGroup group) override;
   void DisableQuery(PerfQueryGroup group) override;

Source/Core/VideoCommon/PerfQueryBase.h

@@ -34,6 +34,8 @@ public:
   PerfQueryBase() : m_query_count(0) {}
   virtual ~PerfQueryBase() {}
 
+  virtual bool Initialize() { return true; }
+
   // Checks if performance queries are enabled in the gameini configuration.
   // NOTE: Called from CPU+GPU thread
   static bool ShouldEmulate();

Source/Core/VideoCommon/VideoBackendBase.cpp

@@ -371,9 +371,9 @@ bool VideoBackendBase::InitializeShared(std::unique_ptr<AbstractGfx> gfx,
   TMEM::Init();
 
   if (!g_vertex_manager->Initialize() || !g_shader_cache->Initialize() ||
-      !g_renderer->Initialize() || !g_presenter->Initialize() ||
-      !g_framebuffer_manager->Initialize() || !g_texture_cache->Initialize() ||
-      !g_bounding_box->Initialize())
+      !g_perf_query->Initialize() || !g_renderer->Initialize() ||
+      !g_presenter->Initialize() || !g_framebuffer_manager->Initialize() ||
+      !g_texture_cache->Initialize() || !g_bounding_box->Initialize())
   {
     PanicAlertFmtT("Failed to initialize renderer classes");
     Shutdown();