Propagate auto-resize viewport values to OOPIF processes

content/browser/web_contents/web_contents_impl.h

Index: content/browser/web_contents/web_contents_impl.h
diff --git a/content/browser/web_contents/web_contents_impl.h b/content/browser/web_contents/web_contents_impl.h
index e71d078ca6b91171c2f33b5ad4d1008640cdb61a..3b589327633783567dc7972421fabc7545e49d34 100644
--- a/content/browser/web_contents/web_contents_impl.h
+++ b/content/browser/web_contents/web_contents_impl.h
@@ -668,6 +668,8 @@ class CONTENT_EXPORT WebContentsImpl
                               bool width_changed) override;
   void ResizeDueToAutoResize(RenderWidgetHostImpl* render_widget_host,
                              const gfx::Size& new_size) override;
+  gfx::Size GetAutoResizeSize() override;
+  void ResetAutoResizeSize() override;
   void ScreenInfoChanged() override;
   void UpdateDeviceScaleFactor(double device_scale_factor) override;
   void GetScreenInfo(ScreenInfo* screen_info) override;
@@ -1446,6 +1448,10 @@ class CONTENT_EXPORT WebContentsImpl
   // this overrides |preferred_size_|.
   gfx::Size preferred_size_for_capture_;
 
+  // Size set by a top-level frame with auto-resize enabled. This is needed by
+  // out-of-process iframes for their visible viewport size.
+  gfx::Size auto_resize_size_;
+
 #if defined(OS_ANDROID)
   // Date time chooser opened by this tab.
   // Only used in Android since all other platforms use a multi field UI.