Add UMA metrics to measure the effectiveness of views fuzzing

chrome/browser/ui/views/tabs/tab.h

Index: chrome/browser/ui/views/tabs/tab.h
diff --git a/chrome/browser/ui/views/tabs/tab.h b/chrome/browser/ui/views/tabs/tab.h
index 91ddca874b64fb519930a6e1d501a9facc486f5d..534091fba50500a64b1d6f38d44551dee92c4e45 100644
--- a/chrome/browser/ui/views/tabs/tab.h
+++ b/chrome/browser/ui/views/tabs/tab.h
@@ -100,6 +100,14 @@ class Tab : public TabAudioIndicator::Delegate,
     background_offset_ = offset;
   }
 
+  // Returns true if this tab became the active tab selected in
+  // response to the last ui::ET_GESTURE_BEGIN gesture dispatched to
+  // this tab. Only used for collecting UMA metrics.
+  // See ash/touch/touch_uma.cc.
+  bool tab_activated_with_last_gesture_begin() const {
+    return tab_activated_with_last_gesture_begin_;
+  }
+
   views::GlowHoverController* hover_controller() {
     return &hover_controller_;
   }
@@ -320,6 +328,8 @@ class Tab : public TabAudioIndicator::Delegate,
 
   ui::ThemeProvider* theme_provider_;
 
+  bool tab_activated_with_last_gesture_begin_;
+
   views::GlowHoverController hover_controller_;
 
   // The bounds of various sections of the display.