[FYI] All-in-one OnCandidateWindow{Show,Update,Hide}

ui/base/ime/input_method_tsf.cc

Index: ui/base/ime/input_method_tsf.cc
diff --git a/ui/base/ime/input_method_tsf.cc b/ui/base/ime/input_method_tsf.cc
index 5e6de052e55a0f9e38fbbd772e253e3b3aee0139..bf7708c4fc9238e2290bb8562554ade6abe9dd22 100644
--- a/ui/base/ime/input_method_tsf.cc
+++ b/ui/base/ime/input_method_tsf.cc
@@ -12,7 +12,7 @@ namespace ui {
 
 class InputMethodTSF::TSFEventObserver : public TSFEventRouterObserver {
  public:
-  TSFEventObserver() : is_candidate_popup_open_(false) {}
+  TSFEventObserver() : is_candidate_popup_open_(false), window_count_(0) {}
 
   // Returns true if we know for sure that a candidate window (or IME suggest,
   // etc.) is open.
@@ -21,11 +21,22 @@ class InputMethodTSF::TSFEventObserver : public TSFEventRouterObserver {
   // Overridden from TSFEventRouterObserver:
   virtual void OnCandidateWindowCountChanged(size_t window_count) OVERRIDE {
     is_candidate_popup_open_ = (window_count != 0);
+    if (window_count_ == 0 && window_count) {
+      TSFBridge::GetInstance()->OnCandidateWindowShown();
+    } else if (window_count_ && window_count) {
+      TSFBridge::GetInstance()->OnCandidateWindowUpdated();
+    } else if (window_count_ && window_count == 0) {
+      TSFBridge::GetInstance()->OnCandidateWindowHidden();
+    }
+    window_count_ = window_count;
   }
 
  private:
   // True if we know for sure that a candidate window is open.
   bool is_candidate_popup_open_;
+  // Number of visible windows for showing candidates and their related
+  // information.
+  int window_count_;
 
   DISALLOW_COPY_AND_ASSIGN(TSFEventObserver);
 };