Add support for not owning distilled WebContents

chrome/browser/dom_distiller/tab_utils.h

Index: chrome/browser/dom_distiller/tab_utils.h
diff --git a/chrome/browser/dom_distiller/tab_utils.h b/chrome/browser/dom_distiller/tab_utils.h
index d10a3c8d4b3959f8e0bf50a7098dba158285b07a..ab05a5a56d74114c40052f5ef4550c2aa1d07328 100644
--- a/chrome/browser/dom_distiller/tab_utils.h
+++ b/chrome/browser/dom_distiller/tab_utils.h
@@ -14,4 +14,10 @@ class WebContents;
 // takes ownership over the old WebContents after swapping in the new one.
 void DistillCurrentPageAndView(content::WebContents* old_web_contents);
 
+// Starts distillation in the |source_web_contents| while navigating the
+// |destination_web_contents| to view the distilled content. This does not take
+// ownership of any WebContents.
+void DistillAndView(content::WebContents* source_web_contents,
+                    content::WebContents* destination_web_contents);
+
 #endif  // CHROME_BROWSER_DOM_DISTILLER_TAB_UTILS_H_