Observe input metrics from web content area.

chrome/browser/ui/cocoa/browser_window_controller.mm

Index: chrome/browser/ui/cocoa/browser_window_controller.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_controller.mm b/chrome/browser/ui/cocoa/browser_window_controller.mm
index 4ab8af89a5846f6f22131b898c78520a55fe9f89..8278acd04491f8ab64cb4f239f213d1fa9e16aa6 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller.mm
+++ b/chrome/browser/ui/cocoa/browser_window_controller.mm
@@ -598,9 +598,9 @@ bool IsTabDetachingInFullscreenEnabled() {
 
 // Called right after our window became the main window.
 - (void)windowDidBecomeMain:(NSNotification*)notification {
-  if (chrome::GetLastActiveBrowser() != browser_.get()) {
+//  if (chrome::GetLastActiveBrowser() != browser_.get()) {
     BrowserList::SetLastActive(browser_.get());
-  }
+  //}
   // Always saveWindowPositionIfNeeded when becoming main, not just
   // when |browser_| is not the last active browser. See crbug.com/536280 .
   [self saveWindowPositionIfNeeded];
@@ -624,6 +624,8 @@ bool IsTabDetachingInFullscreenEnabled() {
 
   extensions::ExtensionCommandsGlobalRegistry::Get(browser_->profile())
       ->set_registry_for_active_window(nullptr);
+
+  BrowserList::NotifyBrowserNoLongerActive(browser_.get());
 }
 
 // Called when we have been minimized.