Request to start/stop calculating composition info from RenderWidget when it is active/inactive.

content/browser/renderer_host/render_widget_host_view_aura.h

Index: content/browser/renderer_host/render_widget_host_view_aura.h
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.h b/content/browser/renderer_host/render_widget_host_view_aura.h
index 813265c77f3a3aa480b61f0a6020a15278fea042..71778821da6a5e89518ee5e3739ad5d5836c0ccf 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.h
+++ b/content/browser/renderer_host/render_widget_host_view_aura.h
@@ -687,6 +687,11 @@ class CONTENT_EXPORT RenderWidgetHostViewAura
   // RenderWidgetHostInputEventRouter.
   bool disable_input_event_router_for_testing_;
 
+  // The routing and process IDs for the last RenderWidgetHost which had a
+  // TextInputState of non-NONE.
+  int32_t last_active_widget_process_id_;
+  int32_t last_active_widget_routing_id_;
+
   base::WeakPtrFactory<RenderWidgetHostViewAura> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAura);