I suspect this is a contributor to  Issue 746597 . I am investigating as part of  Issue 752900 .

Calls are coming from

-[TabStripController clickNewTabButton:] + 372 ... Browser::ActiveTabChanged()
 -> Browser::UpdateToolbar
  -> -[BrowserWindowController updateToolbarWithContents:]
    -> LocationBarViewMac::Update(WebContents*)
      -> LocationBarViewMac::UpdateManagePasswordsIconAndBubble() -> LocationBarViewMac::OnDecorationsChanged() -> -[AutocompleteTextField updateMouseTracking]
      -> LocationBarViewMac::UpdateSaveCreditCardIcon() -> LocationBarViewMac::OnDecorationsChanged() -> -[AutocompleteTextField updateMouseTracking]
    -> -[ToolbarController updateToolbarWithContents:] -> LocationBarViewMac::Update(content::WebContents const*)
      -> OmniboxViewMac::OnTabChanged(content::WebContents const*) + 110 ... OmniboxEditModel::OnChanged() ... -> LocationBarViewMac::UpdateLocationIcon() -> LocationBarViewMac::Layout()
        -> -[AutocompleteTextFieldCell clearDecorations]
        -> LocationBarViewMac::OnDecorationsChanged() -> -[AutocompleteTextField updateMouseTracking]
        -> above two repeat
      -> LocationBarViewMac::OnChanged() -> LocationBarViewMac::UpdateLocationIcon() -> LocationBarViewMac::Layout()
        -> -[AutocompleteTextFieldCell clearDecorations]
        -> LocationBarViewMac::OnDecorationsChanged() -> -[AutocompleteTextField updateMouseTracking]
    -> -[AutocompleteTextField updateMouseTracking] + 302
 -> chrome::BrowserCommandController::TabStateChanged() + 21 -> UpdateCommandsForTabState() -> BrowserWindowCocoa::SetStarredState -> LocationBarViewMac::SetStarred(bool) -> LocationBarViewMac::OnDecorationsChanged() -> updateMouseTracking
content::RenderFrameHostImpl::OnDidStartProvisionalLoad -> BookmarkTabHelper::DidStartNavigation -> BrowserWindowCocoa::SetStarredState -> (as above)
content::RenderFrameHostImpl::OnDidCommitProvisionalLoad -> NotifyNavigationEntryCommitted
 -> DidCommitProvisionalLoad -> VisibleSecurityStateChanged -> Browser::UpdateToolbar(bool)
  (9 calls above from the UpdateToolbar invoked via ActiveTabChanged repeat)
 -> NotifyNavigationStateChanged -> Browser::ScheduleUIUpdate -> Browser::UpdateToolbar(bool)
  (more repeats, but only 5 this time: UpdateManagePasswordsIconAndBubble, UpdateSaveCreditCardIcon, UpdateLocationIcon,  -[ToolbarController updateToolbarWithContents:])
 -> content::NavigatorImpl::DidNavigate -> content::WebContentsImpl::DidFinishNavigation -> LocationBarViewMac::UpdateManagePasswordsIconAndBubble() -> LocationBarViewMac::OnDecorationsChanged()

Assignign to tapted, since he says he's investigating in c#1.

I won't be looking at this any time soon. views doesn't have tracking areas, so this could potentially just go away. Doesn't seem to do anything bad by itself (apart from  Issue 746597 , assuming they're related).

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

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