Canvas capture from inactive tab

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 6a5ba60abdbc441433f57f9c6f5708978bcdd7a0..89c61190f676c623df47a56250b5142ce2de2595 100644
--- a/content/browser/web_contents/web_contents_impl.h
+++ b/content/browser/web_contents/web_contents_impl.h
@@ -919,6 +919,9 @@ class CONTENT_EXPORT WebContentsImpl
   void OnHideValidationMessage();
   void OnMoveValidationMessage(const gfx::Rect& anchor_in_root_view);
 
+  void OnIncrementCapturerCount();
+  void OnDecrementCapturerCount();
+
   // Called by derived classes to indicate that we're no longer waiting for a
   // response. This won't actually update the throbber, but it will get picked
   // up at the next animation step if the throbber is going.