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

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index 3362aecf01defdbf2d288f7b99bfb11d20ade97f..c76476bafaf34ff41134454ee4d6a03c46b13bff 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -468,6 +468,7 @@ RenderWidgetHostViewAura::RenderWidgetHostViewAura(RenderWidgetHost* host,
       set_focus_on_mouse_down_or_key_event_(false),
       device_scale_factor_(0.0f),
       disable_input_event_router_for_testing_(false),
+      last_active_widget_(nullptr),
       weak_ptr_factory_(this) {
   if (!is_guest_view_hack_)
     host_->SetView(this);
@@ -2994,24 +2995,24 @@ void RenderWidgetHostViewAura::OnUpdateTextInputStateCalled(
     GetInputMethod()->OnTextInputTypeChanged(this);
 
   const TextInputState* state = text_input_manager_->GetTextInputState();
-
   if (state && state->show_ime_if_needed &&
       state->type != ui::TEXT_INPUT_TYPE_NONE) {
     GetInputMethod()->ShowImeIfNeeded();
-
     // Start monitoring the composition information if the focused node is
     // editable.
-    host_->Send(new InputMsg_RequestCompositionUpdate(
-        host_->GetRoutingID(),
-        false /* immediate request */,
+    last_active_widget_ = text_input_manager_->GetActiveWidget();
+    last_active_widget_->Send(new InputMsg_RequestCompositionUpdate(
+        last_active_widget_->GetRoutingID(), false /* immediate request */,
         true /* monitor request */));
   } else {
     // Stop monitoring the composition information if the focused node is not
     // editable.
-    host_->Send(new InputMsg_RequestCompositionUpdate(
-        host_->GetRoutingID(),
-        false /* immediate request */,
-        false /* monitor request */));
+    if (last_active_widget_) {
+      last_active_widget_->Send(new InputMsg_RequestCompositionUpdate(
+          last_active_widget_->GetRoutingID(), false /* immediate request */,
+          false /* monitor request */));
+      last_active_widget_ = nullptr;
+    }
   }
 }