[NOT FOR REVIEW] [reland] Browser Side Text Input State Tracking for OOPIF (Aura Only)

content/browser/renderer_host/render_widget_host_view_base.h

Index: content/browser/renderer_host/render_widget_host_view_base.h
diff --git a/content/browser/renderer_host/render_widget_host_view_base.h b/content/browser/renderer_host/render_widget_host_view_base.h
index 8eb96897ecc8dc2feca83d74474372a6cdcf1550..0b0c12d8c5f5a54eb60ce415cb52dc7377f6a79c 100644
--- a/content/browser/renderer_host/render_widget_host_view_base.h
+++ b/content/browser/renderer_host/render_widget_host_view_base.h
@@ -21,6 +21,7 @@
 #include "cc/output/compositor_frame.h"
 #include "cc/surfaces/surface_id.h"
 #include "content/browser/renderer_host/event_with_latency_info.h"
+#include "content/browser/renderer_host/text_input_manager.h"
 #include "content/common/content_export.h"
 #include "content/common/input/input_event_ack_state.h"
 #include "content/public/browser/readback_types.h"
@@ -72,8 +73,10 @@ struct NativeWebKeyboardEvent;
 struct TextInputState;
 
 // Basic implementation shared by concrete RenderWidgetHostView subclasses.
-class CONTENT_EXPORT RenderWidgetHostViewBase : public RenderWidgetHostView,
-                                                public IPC::Listener {
+class CONTENT_EXPORT RenderWidgetHostViewBase
+    : public RenderWidgetHostView,
+      public IPC::Listener,
+      public TextInputManager::Observer {
  public:
   ~RenderWidgetHostViewBase() override;
 
@@ -240,6 +243,9 @@ class CONTENT_EXPORT RenderWidgetHostViewBase : public RenderWidgetHostView,
                                                cc::SurfaceId original_surface,
                                                gfx::Point* transformed_point);
 
+  // Updates the state of the input method attached to the view.
+  virtual void TextInputStateChanged(const TextInputState& text_input_state);
+
   //----------------------------------------------------------------------------
   // The following static methods are implemented by each platform.
 
@@ -265,9 +271,6 @@ class CONTENT_EXPORT RenderWidgetHostViewBase : public RenderWidgetHostView,
   // Indicates whether the page has finished loading.
   virtual void SetIsLoading(bool is_loading) = 0;
 
-  // Updates the state of the input method attached to the view.
-  virtual void TextInputStateChanged(const TextInputState& params) = 0;
-
   // Cancel the ongoing composition of the input method attached to the view.
   virtual void ImeCancelComposition() = 0;
 
@@ -385,6 +388,11 @@ class CONTENT_EXPORT RenderWidgetHostViewBase : public RenderWidgetHostView,
 
   void NotifyObserversAboutShutdown();
 
+  // Returns a reference to the current instance of TextInputManager. If no
+  // no reference is found, this method tries to obtain one from the RWHD.
+  // Returns nullptr if no reference exists or obtained.
+  TextInputManager* GetTextInputManager();
+
   // Whether this view is a popup and what kind of popup it is (select,
   // autofill...).
   blink::WebPopupType popup_type_;
@@ -412,7 +420,6 @@ class CONTENT_EXPORT RenderWidgetHostViewBase : public RenderWidgetHostView,
   // The current selection range relative to the start of the web page.
   gfx::Range selection_range_;
 
- protected:
   // The scale factor of the display the renderer is currently on.
   float current_device_scale_factor_;
 
@@ -423,9 +430,17 @@ class CONTENT_EXPORT RenderWidgetHostViewBase : public RenderWidgetHostView,
   // renderer.
   bool pinch_zoom_enabled_;
 
+  // A reference to the TextInputManager belonging to the top-level
+  // RenderWidgetHostDelegte.
+  TextInputManager* text_input_manager_;
+
  private:
   void FlushInput();
 
+  // TextInputManager::Observer overrides.
+  void OnTextInputManagerDestroyed(
+      TextInputManager* text_input_manager) override;
+
   gfx::Rect current_display_area_;
 
   uint32_t renderer_frame_number_;