Browser Side Text Input State Tracking for OOPIF.

content/browser/frame_host/interstitial_page_impl.h

Index: content/browser/frame_host/interstitial_page_impl.h
diff --git a/content/browser/frame_host/interstitial_page_impl.h b/content/browser/frame_host/interstitial_page_impl.h
index 983fccacccc2650a17182a3b31ef46d2760fb078..801db3ca0349cdf37f5823959415e07e0a6958ca 100644
--- a/content/browser/frame_host/interstitial_page_impl.h
+++ b/content/browser/frame_host/interstitial_page_impl.h
@@ -30,6 +30,7 @@ class NavigationControllerImpl;
 class RenderViewHostImpl;
 class RenderWidgetHostView;
 class WebContentsView;
+struct TextInputState;
 
 enum ResourceRequestAction {
   BLOCK,
@@ -153,6 +154,9 @@ class CONTENT_EXPORT InterstitialPageImpl
 
   // RenderWidgetHostDelegate implementation:
   void RenderWidgetDeleted(RenderWidgetHostImpl* render_widget_host) override;
+  TextInputState GetTextInputState() override;
+  void UpdateTextInputState(RenderWidgetHostViewBase* rwhv,
+                            bool text_input_state_changed) override;
   bool PreHandleKeyboardEvent(const NativeWebKeyboardEvent& event,
                               bool* is_keyboard_shortcut) override;
   void HandleKeyboardEvent(const NativeWebKeyboardEvent& event) override;
@@ -298,6 +302,8 @@ class CONTENT_EXPORT InterstitialPageImpl
 
   scoped_refptr<SessionStorageNamespace> session_storage_namespace_;
 
+  TextInputState text_input_state_;
+
   base::WeakPtrFactory<InterstitialPageImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(InterstitialPageImpl);