Add support for providers called when the omnibox is focused.

components/omnibox/autocomplete_provider.h

Index: components/omnibox/autocomplete_provider.h
diff --git a/components/omnibox/autocomplete_provider.h b/components/omnibox/autocomplete_provider.h
index 9c784ba563924f0ec8613fcab84352b7e21f2c1f..eab34797488dd6f90dd050d1f9dfc21be5eb908c 100644
--- a/components/omnibox/autocomplete_provider.h
+++ b/components/omnibox/autocomplete_provider.h
@@ -197,6 +197,9 @@ class AutocompleteProvider
   // Returns this provider's type.
   Type type() const { return type_; }
 
+  // Returns whether the provider should be used when the omnibox is focused.

[Peter Kasting, 2014/12/30 21:18:23]

Nit: How about this comment and name:

  // Returns whether the provider wants to provide matches in response to the
  // omnibox being focused.
  virtual bool ProvidesMatchesOnOmniboxFocus() const;

[jif, 2014/12/31 19:02:26]

Done.

+  virtual bool ActivatedOnOmniboxFocus() const;
+
   // Returns a string describing this provider's type.
   const char* GetName() const;