Implement the 2016Q2 Translate UI designe spec out in

chrome/browser/ui/translate/translate_bubble_view_state_transition.h

Index: chrome/browser/ui/translate/translate_bubble_view_state_transition.h
diff --git a/chrome/browser/ui/translate/translate_bubble_view_state_transition.h b/chrome/browser/ui/translate/translate_bubble_view_state_transition.h
index 383bc24cb7ad754f3125c320470585ac12c2cd5d..3c16d2c5260a52d00e69e4d0e8af4df5f0289a87 100644
--- a/chrome/browser/ui/translate/translate_bubble_view_state_transition.h
+++ b/chrome/browser/ui/translate/translate_bubble_view_state_transition.h
@@ -8,6 +8,65 @@
 #include "base/macros.h"
 #include "chrome/browser/ui/translate/translate_bubble_model.h"
 
+namespace translate {
+
+enum TranslateBubbleUiEvent {
+  // The user clicked the advanced option.
+  SET_STATE_OPTIONS,
+
+  // The user clicked down and went back from the advanced option.

[msw, 2016/04/29 23:43:40]

nit: I'm not sure what 'clicked down' means, do you just mean 'clicked'?
Otherwise, what does the user actually click to return to the normal view?

[ftang, 2016/04/30 01:24:50]

Done.

+  LEAVE_STATE_OPTIONS,
+
+  // The user clicked the advanced link.
+  ADVANCED_LINK_CLICKED,
+
+  // The user checked the "always translate" checkbox.
+  ALWAYS_TRANSLATE_CHECKED,
+
+  // The user unchecked the "always translate" checkbox.
+  ALWAYS_TRANSLATE_UNCHECKED,
+
+  // The user selected the "Nope" in option menu.

[msw, 2016/04/29 23:43:40]

nit: grammar here and elsewhere, but whatever...

[ftang, 2016/04/30 01:24:50]

Done.

+  NOPE_MENU_CLICKED,
+
+  // The user selected the "Never translate language" in option menu.
+  NEVER_TRANSLATE_LANGUAGE_MENU_CLICKED,
+
+  // The user selected the "Never translate this site" in option menu.
+  NEVER_TRANSLATE_SITE_MENU_CLICKED,
+
+  // The user clicked "Translate" button.

[msw, 2016/04/29 23:43:40]

nit: 'clicked the'

[ftang, 2016/04/30 01:24:50]

Done.

+  TRANSLATE_BUTTON_CLICKED,
+
+  // The user clicked the "Done" button.
+  DONE_BUTTON_CLICKED,
+
+  // The user clicked the "Cancel" button.
+  CANCEL_BUTTON_CLICKED,
+
+  // The user clicked the "Closed" [X] button.
+  CLOSE_BUTTON_CLICKED,
+
+  // The user clicked the "Try Again" button.
+  TRY_AGAIN_BUTTON_CLICKED,
+
+  // The user clicked the "Show Original" button.
+  SHOW_ORIGINAL_BUTTON_CLICKED,
+
+  // The user clicked the "Setting" link.

[msw, 2016/04/29 23:43:40]

nit: Settings

[ftang, 2016/04/30 01:24:50]

Done.

+  SETTING_LINK_CLICKED,

[msw, 2016/04/29 23:43:40]

nit: SETTINGS

[ftang, 2016/04/30 01:24:50]

Done.

+
+  // The user changed the "Source language".
+  SOURCE_LANGUAGE_MENU_CLICKED,
+
+  // The user changed the "Target language".
+  TARGET_LANGUAGE_MENU_CLICKED,
+
+  TRANSLATE_BUBBLE_UI_EVENT_MAX
+};
+
+}  // namespace translate
+
 // The class which manages the transition of the view state of the Translate
 // bubble.
 class TranslateBubbleViewStateTransition {