Bug 1487964 - Do not report resource-timing subdocument loads triggered by that subdocument r=bzbarsky

Differential Revision: https://phabricator.services.mozilla.com/D9503

docshell/base/nsDocShellLoadState.cpp

@@ -30,6 +30,7 @@ nsDocShellLoadState::nsDocShellLoadState()
   , mTypeHint(VoidCString())
   , mFileName(VoidString())
   , mDocShellInternalLoadFlags(0)
+  , mIsFromProcessingFrameAttributes(false)
 {
 }