Invokes TabParentingGlobalObserver for every Tab parented.

ios/chrome/browser/tabs/tab_model.mm

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/chrome/browser/tabs/tab_model.h"
 
 #include <list>
 #include <utility>
 #include <vector>
 
@@ skipping 563 matching lines @@
   [self insertTab:tab atIndex:index];
   return tab;
 }
 
 - (void)insertTab:(Tab*)tab atIndex:(NSUInteger)index {
   DCHECK(tab);
   DCHECK(index <= [_tabs count]);
   [tab fetchFavicon];
   [_tabs insertObject:tab atIndex:index];
 
+  TabParentingGlobalObserver::GetInstance()->OnTabParented(tab.webState);
   [_observers tabModel:self didInsertTab:tab atIndex:index inForeground:NO];
   [_observers tabModelDidChangeTabCount:self];
 
   base::RecordAction(base::UserMetricsAction("MobileNewTabOpened"));
   // Persist the session due to a new tab being inserted. If this is a
   // background tab (will not become active), saving now will capture the
   // state properly. If it does eventually become active, another save will
   // be triggered to properly capture the end result.
   [self saveSessionImmediately:NO];
   ++_newTabCount;
@@ skipping 19 matching lines @@
            withTab:(Tab*)newTab
     keepOldTabOpen:(BOOL)keepOldTabOpen {
   NSUInteger index = [self indexOfTab:oldTab];
   DCHECK_NE(NSNotFound, static_cast<NSInteger>(index));
 
   base::scoped_nsobject<Tab> tabSaver([oldTab retain]);
   [newTab fetchFavicon];
   [_tabs replaceObjectAtIndex:index withObject:newTab];
   [newTab setParentTabModel:self];
 
+  TabParentingGlobalObserver::GetInstance()->OnTabParented(newTab.webState);
   [_observers tabModel:self didReplaceTab:oldTab withTab:newTab atIndex:index];
 
   if (self.currentTab == oldTab)
     [self changeSelectedTabFrom:nil to:newTab persistState:NO];
 
   [oldTab setParentTabModel:nil];
   if (!keepOldTabOpen)
     [oldTab close];
 
   // Record a tab clobber, since swapping tabs bypasses the tab code that would
@@ skipping 440 matching lines @@
   web::NavigationManager::WebLoadParams params(URL);
   params.referrer = referrer;
   params.transition_type = ui::PAGE_TRANSITION_TYPED;
   [[tab webController] loadWithParams:params];
   [tab webController].webUsageEnabled = webUsageEnabled_;
   [self insertTab:tab atIndex:index];
   return tab;
 }
 
 @end