Track the original opener of a webcontents so we can rely on it for popups

content/public/browser/web_contents.h

Index: content/public/browser/web_contents.h
diff --git a/content/public/browser/web_contents.h b/content/public/browser/web_contents.h
index 98c79247aec25c919a5593a67da809b1bf7f4684..8575d4f2e28e5818b72e480fa006abb7ad6feeb2 100644
--- a/content/public/browser/web_contents.h
+++ b/content/public/browser/web_contents.h
@@ -638,6 +638,14 @@ class WebContents : public PageNavigator,
   // Returns the opener if HasOpener() is true, or nullptr otherwise.
   virtual WebContents* GetOpener() const = 0;
 
+  // Returns true if this WebContents was opened by another WebContents, even
+  // if the opener was suppressed.

[Avi (use Gerrit), 2017/02/03 19:26:33]

... even if the JavaScript opener was suppressed...?

If we can make it clear that "opener" is the JavaScript one, but "original
opener" actually means "the WC that opened this one".

+  virtual bool HasOriginalOpener() const = 0;
+
+  // Returns the original opener if HasOriginalOpener() is true, or nullptr
+  // otherwise.
+  virtual WebContents* GetOriginalOpener() const = 0;
+
   typedef base::Callback<void(
       int, /* id */
       int, /* HTTP status code */