Add support for omnibox.onInputStarted and onInputCancelled.

chrome/browser/extensions/extension_omnibox_api.h

Index: chrome/browser/extensions/extension_omnibox_api.h
diff --git a/chrome/browser/extensions/extension_omnibox_api.h b/chrome/browser/extensions/extension_omnibox_api.h
index 4af9ee5d1a776b7527f12c1d087b3cf7737f3215..320b40af1391bd3177ed910c2e3d526b6516eae9 100644
--- a/chrome/browser/extensions/extension_omnibox_api.h
+++ b/chrome/browser/extensions/extension_omnibox_api.h
@@ -12,6 +12,11 @@
 // Event router class for events related to the omnibox API.
 class ExtensionOmniboxEventRouter {
  public:
+  // The user has just typed the omnibox keyword. This is sent exactly once in
+  // a given input session, before any OnInputChanged events.
+  static void OnInputStarted(
+      Profile* profile, const std::string& extension_id);
+
   // The user has changed what is typed into the omnibox while in an extension
   // keyword session. Returns true if someone is listening to this event, and
   // thus we have some degree of confidence we'll get a response.
@@ -24,6 +29,11 @@ class ExtensionOmniboxEventRouter {
       Profile* profile, const std::string& extension_id,
       const std::string& input);
 
+  // The user has cleared the keyword, or closed the omnibox popup. This is
+  // sent at most once in a give input session, after any OnInputChanged events.
+  static void OnInputCancelled(
+      Profile* profile, const std::string& extension_id);
+
  private:
   DISALLOW_COPY_AND_ASSIGN(ExtensionOmniboxEventRouter);
 };