Add overflow indicator count on Windows.

chrome/browser/ui/panels/panel_overflow_strip.h

Index: chrome/browser/ui/panels/panel_overflow_strip.h
diff --git a/chrome/browser/ui/panels/panel_overflow_strip.h b/chrome/browser/ui/panels/panel_overflow_strip.h
index 32ff32c3f284c49308147c28e890a148701dbd0b..f7411cf41b6c628dd790e5f3d7067b0d9c7e0e19 100644
--- a/chrome/browser/ui/panels/panel_overflow_strip.h
+++ b/chrome/browser/ui/panels/panel_overflow_strip.h
@@ -9,17 +9,21 @@
 #include <vector>
 #include "chrome/browser/ui/panels/panel.h"
 #include "chrome/browser/ui/panels/panel_mouse_watcher_observer.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
 #include "ui/base/animation/animation_delegate.h"
 
 class Browser;
 class PanelManager;
+class PanelOverflowIndicator;
 namespace ui {
 class SlideAnimation;
 }
 
 // Manipulates all the panels that are placed on the left-most overflow area.
 class PanelOverflowStrip : public PanelMouseWatcherObserver,
-                           public ui::AnimationDelegate {
+                           public ui::AnimationDelegate,
+                           public content::NotificationObserver {
  public:
   typedef std::vector<Panel*> Panels;
 
@@ -41,6 +45,9 @@ class PanelOverflowStrip : public PanelMouseWatcherObserver,
   void OnPanelExpansionStateChanged(
       Panel* panel, Panel::ExpansionState old_state);
 
+  // Called when a panel is starting/stopping drawing an attention.
+  void OnPanelAttentionStateChanged(Panel* panel);
+
   // Refreshes the layouts for all panels to reflect any possible changes.
   void Refresh();
 
@@ -55,8 +62,16 @@ class PanelOverflowStrip : public PanelMouseWatcherObserver,
 #ifdef UNIT_TEST
   int current_display_width() const { return current_display_width_; }
 
-  void set_max_visible_panels(int max_visible_panels) {
-    max_visible_panels_ = max_visible_panels;
+  PanelOverflowIndicator* overflow_indicator() const {
+    return overflow_indicator_.get();
+  }
+
+  void set_max_visible_panels_on_shrunk(int max_visible_panels) {
+    max_visible_panels_on_shrunk_ = max_visible_panels;
+  }
+
+  void set_max_visible_panels_on_expanded(int max_visible_panels) {
+    max_visible_panels_on_expanded_ = max_visible_panels;
   }
 #endif
 
@@ -68,10 +83,18 @@ class PanelOverflowStrip : public PanelMouseWatcherObserver,
   virtual void AnimationEnded(const ui::Animation* animation) OVERRIDE;
   virtual void AnimationProgressed(const ui::Animation* animation) OVERRIDE;
 
+  // Overridden from NotificationObserver:
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+  void UpdateMaxVisibkePanelsOnExpanded();
   void UpdateCurrentWidth();
 
   void DoRefresh(size_t start_index, size_t end_index);
 
+  void UpdateOverflowIndicator(int width);
+
   // Computes the layout of the |index| panel to fit into the area.
   // Empty bounds will be returned if this is not possible due to not enough
   // space.
@@ -83,6 +106,11 @@ class PanelOverflowStrip : public PanelMouseWatcherObserver,
   bool ShouldShowOverflowTitles(const gfx::Point& mouse_position) const;
   void ShowOverflowTitles(bool show_overflow_titles);
 
+  int max_visible_panels() const {
+    return are_overflow_titles_shown_ ? max_visible_panels_on_expanded_
+                                      : max_visible_panels_on_shrunk_;
+  }
+
   // Weak pointer since PanelManager owns PanelOverflowStrip instance.
   PanelManager* panel_manager_;
 
@@ -99,7 +127,12 @@ class PanelOverflowStrip : public PanelMouseWatcherObserver,
   int current_display_width_;
 
   // Maximium number of overflow panels allowed to be shown.
-  int max_visible_panels_;
+  int max_visible_panels_on_shrunk_;
+  int max_visible_panels_on_expanded_;
+
+  // User to show "+N" indicator when number of overflow panels exceed
+  // |max_visible_panels_on_shrunk_|.
+  scoped_ptr<PanelOverflowIndicator> overflow_indicator_;
 
   // For mouse hover-over effect.
   bool are_overflow_titles_shown_;
@@ -107,6 +140,9 @@ class PanelOverflowStrip : public PanelMouseWatcherObserver,
   int overflow_hover_animator_start_width_;
   int overflow_hover_animator_end_width_;
 
+  // Registrar for receiving the shut down notification.
+  content::NotificationRegistrar registrar_;
+
   // Invalid panel index.
   static const size_t kInvalidPanelIndex = static_cast<size_t>(-1);