Use the window coordinate for the autofill bounds.

content/public/renderer/render_view.h

Index: content/public/renderer/render_view.h
diff --git a/content/public/renderer/render_view.h b/content/public/renderer/render_view.h
index dcf1de48b91b86ddc650004fce17e9a0ef71e1e6..acaf3e8dbf0ee28b1954fd9be370ff534ccf62c4 100644
--- a/content/public/renderer/render_view.h
+++ b/content/public/renderer/render_view.h
@@ -24,6 +24,7 @@ class WebString;
 class WebURLRequest;
 class WebView;
 struct WebContextMenuData;
+struct WebRect;
 }
 
 namespace gfx {
@@ -123,6 +124,9 @@ class CONTENT_EXPORT RenderView : public IPC::Sender {
                                       bool animate) = 0;
 #endif
 
+  // Converts the |rect| from viewport coordinates to window coordinates.

[bokan, 2015/12/03 20:49:20]

Could you add a bit of description here (or elsewhere if it makes more sense) on
what |viewport| and what |window| coordinates are?

[oshima, 2015/12/03 21:58:17]

I updated here for now, but I think we should update the chromium doc and point
to that instead once migration is completed.

+  virtual void convertViewportToWindow(blink::WebRect* rect) = 0;
+
  protected:
   ~RenderView() override {}