Add message and Help Center link to the chooser UI

chrome/browser/ui/website_settings/chooser_bubble_delegate.h

Index: chrome/browser/ui/website_settings/chooser_bubble_delegate.h
diff --git a/chrome/browser/ui/website_settings/chooser_bubble_delegate.h b/chrome/browser/ui/website_settings/chooser_bubble_delegate.h
index 1dd40744a8db323360e1e750e3be79bab6dbb210..28e2d962b0ea4917a8ed7908accb6658bfa799c2 100644
--- a/chrome/browser/ui/website_settings/chooser_bubble_delegate.h
+++ b/chrome/browser/ui/website_settings/chooser_bubble_delegate.h
@@ -52,6 +52,9 @@ class ChooserBubbleDelegate : public BubbleDelegate {
     virtual ~Observer() {}
   };
 
+  // Open help center URL.
+  void OpenHelpCenterUrl() const;
+
   // BubbleDelegate:
   std::string GetName() const override;
   scoped_ptr<BubbleUi> BuildBubbleUi() override;
@@ -77,6 +80,9 @@ class ChooserBubbleDelegate : public BubbleDelegate {
   // closes without the user taking an explicit action.
   virtual void Close() = 0;
 
+  // Get help center URL.
+  virtual base::string16 GetHelpCenterUrl() const = 0;

[msw, 2016/02/22 20:13:11]

Why doesn't this return a GURL?

[juncai, 2016/02/22 22:06:37]

There is a follow-up patch for Mac:
https://codereview.chromium.org/1665343003/
And it uses HyperlinkTextView:
https://code.google.com/p/chromium/codesearch#chromium/src/ui/base/cocoa/cont...
which has a NSString* parameter, so I think that returns a base::string16 is
more convenient to use.

[Evan Stade, 2016/02/22 23:15:16]

That is a platform-specific implementation detail. This should return a GURL and
let mac convert if it needs to. This is logically a URL. The type should match
that.

[juncai, 2016/02/23 01:34:21]

Done.

+
   // Only one observer may be registered at a time.
   void set_observer(Observer* observer) { observer_ = observer; }
   Observer* observer() const { return observer_; }