Added UMA collection for fullscreen / mouse lock bubble re-shows.

chrome/browser/ui/exclusive_access/fullscreen_controller.cc

Index: chrome/browser/ui/exclusive_access/fullscreen_controller.cc
diff --git a/chrome/browser/ui/exclusive_access/fullscreen_controller.cc b/chrome/browser/ui/exclusive_access/fullscreen_controller.cc
index 95f0d40ea09f9fbcb43b350fadbdba96db594f98..549993429666aa3d7f5cd6b627639b9e919d9324 100644
--- a/chrome/browser/ui/exclusive_access/fullscreen_controller.cc
+++ b/chrome/browser/ui/exclusive_access/fullscreen_controller.cc
@@ -420,6 +420,10 @@ void FullscreenController::NotifyTabExclusiveAccessLost() {
   }
 }
 
+const char* FullscreenController::HistogramPrefix() {
+  return "Fullscreen";
+}
+
 void FullscreenController::ToggleFullscreenModeInternal(
     FullscreenInternalOption option) {
 #if defined(OS_WIN)
@@ -499,6 +503,7 @@ void FullscreenController::EnterFullscreenModeInternal(
 }
 
 void FullscreenController::ExitFullscreenModeInternal() {
+  Exiting();
   toggled_into_fullscreen_ = false;
 #if defined(OS_MACOSX)
   // Mac windows report a state change instantly, and so we must also clear