Support plumbing LatencyInfo through the old software path.

content/browser/renderer_host/render_widget_host_view_win.h

Index: content/browser/renderer_host/render_widget_host_view_win.h
diff --git a/content/browser/renderer_host/render_widget_host_view_win.h b/content/browser/renderer_host/render_widget_host_view_win.h
index 86751a3456a242770b8f6b11a9b1949ced6e5d88..84a8dd5c86155713ad665673069a19711e63a19d 100644
--- a/content/browser/renderer_host/render_widget_host_view_win.h
+++ b/content/browser/renderer_host/render_widget_host_view_win.h
@@ -192,7 +192,8 @@ class RenderWidgetHostViewWin
   virtual void DidUpdateBackingStore(
       const gfx::Rect& scroll_rect,
       const gfx::Vector2d& scroll_delta,
-      const std::vector<gfx::Rect>& copy_rects) OVERRIDE;
+      const std::vector<gfx::Rect>& copy_rects,
+      const ui::LatencyInfo& latency_info) OVERRIDE;
   virtual void RenderViewGone(base::TerminationStatus status,
                               int error_code) OVERRIDE;
   virtual bool CanSubscribeFrame() const OVERRIDE;
@@ -596,6 +597,8 @@ class RenderWidgetHostViewWin
   // The OS-provided default IAccessible instance for our hwnd.
   base::win::ScopedComPtr<IAccessible> window_iaccessible_;
 
+  ui::LatencyInfo software_latency_info_;
+
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewWin);
 };