Implement TouchSelectionEditing controls for OOPIF.

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 712270847066af3c7dc89d3d85a2e348fc550f32..b86471a79a9d5806342d5b85defea97af78ea4e6 100644
--- a/content/browser/renderer_host/render_widget_host_view_base.h
+++ b/content/browser/renderer_host/render_widget_host_view_base.h
@@ -74,6 +74,7 @@ class RenderWidgetHostImpl;
 class RenderWidgetHostViewBaseObserver;
 class SyntheticGestureTarget;
 class TextInputManager;
+class TouchSelectionControllerClientManager;
 class WebCursor;
 struct NativeWebKeyboardEvent;
 struct TextInputState;
@@ -416,6 +417,13 @@ class CONTENT_EXPORT RenderWidgetHostViewBase : public RenderWidgetHostView,
 
   bool is_fullscreen() { return is_fullscreen_; }
 
+  // This only returns non-null on platforms that implement touch
+  // selection editing (TSE), currently Aura and (soon) Android.
+  // TODO(wjmaclean): update this comment when OOPIF TSE is implemented on
+  // Android.
+  virtual TouchSelectionControllerClientManager*
+  touch_selection_controller_client_manager();
+
   // Exposed for testing.
   virtual bool IsChildFrameForTesting() const;
   virtual cc::SurfaceId SurfaceIdForTesting() const;