Add pin icon to the omnibar in windows 8 metro mode.

chrome/browser/ui/metro_pin_tab_helper.h

Index: chrome/browser/ui/metro_pin_tab_helper.h
diff --git a/chrome/browser/ui/metro_pin_tab_helper.h b/chrome/browser/ui/metro_pin_tab_helper.h
index c72e503236209ea9eb48a5f37c71b16d2b93737e..6700773c13c2f3d8145cfc824c1e5d551ca3b480 100644
--- a/chrome/browser/ui/metro_pin_tab_helper.h
+++ b/chrome/browser/ui/metro_pin_tab_helper.h
@@ -10,11 +10,23 @@
 // Per-tab class to help manage metro pinning.
 class MetroPinTabHelper : public content::WebContentsObserver {
  public:
-  explicit MetroPinTabHelper(content::WebContents* tab_contents);
+  // Objects implement this interface to get notified about changes in the
+  // metro pinned state.
+  class Delegate {

[sky, 2012/07/20 16:46:41]

Move this into its own file.

[benwells, 2012/07/23 08:03:43]

Done.

+   public:
+    // Notification that the pinned state of the current URL changed.
+    virtual void IsPinnedChanged(content::WebContents* source, bool pinned) = 0;
+
+   protected:
+    virtual ~Delegate();
+  };
+  explicit MetroPinTabHelper(content::WebContents* web_contents);
   virtual ~MetroPinTabHelper();
 
   bool is_pinned() const { return is_pinned_; }
 
+  void set_delegate(Delegate* delegate) { delegate_ = delegate; }
+
   void TogglePinnedToStartScreen();
 
   // content::WebContentsObserver overrides:
@@ -26,9 +38,15 @@ class MetroPinTabHelper : public content::WebContentsObserver {
   // Queries the metro driver about the pinned state of the current URL.
   void UpdatePinnedStateForCurrentURL();
 
+  // Update the pinned state and notify the delegate.
+  void SetIsPinned(bool is_pinned);
+
   // Whether the current URL is pinned to the metro start screen.
   bool is_pinned_;
 
+  // The delegate that we inform when the is_pinned_ state changes.
+  Delegate* delegate_;
+
   DISALLOW_COPY_AND_ASSIGN(MetroPinTabHelper);
 };