Implement a simple Extension App Omnibox provider.

chrome/browser/autocomplete/autocomplete.h

Index: chrome/browser/autocomplete/autocomplete.h
===================================================================
--- chrome/browser/autocomplete/autocomplete.h	(revision 79981)
+++ chrome/browser/autocomplete/autocomplete.h	(working copy)
@@ -43,10 +43,12 @@
 // UNKNOWN input type:
 // --------------------------------------------------------------------|-----
 // Keyword (non-substituting or in keyword UI mode, exact match)       | 1500
+// Extension App (exact match)                                         | 1425
 // HistoryURL (exact or inline autocomplete match)                     | 1400
 // Search Primary Provider (past query in history within 2 days)       | 1399**
 // Search Primary Provider (what you typed)                            | 1300
 // HistoryURL (what you typed)                                         | 1200
+// Extension App (inexact match)                                       | 1175*~
 // Keyword (substituting, exact match)                                 | 1100
 // Search Primary Provider (past query in history older than 2 days)   | 1050--
 // HistoryContents (any match in title of starred page)                | 1000++
@@ -66,9 +68,11 @@
 // REQUESTED_URL input type:
 // --------------------------------------------------------------------|-----
 // Keyword (non-substituting or in keyword UI mode, exact match)       | 1500
+// Extension App (exact match)                                         | 1425
 // HistoryURL (exact or inline autocomplete match)                     | 1400
 // Search Primary Provider (past query in history within 2 days)       | 1399**
 // HistoryURL (what you typed)                                         | 1200
+// Extension App (inexact match)                                       | 1175*~
 // Search Primary Provider (what you typed)                            | 1150
 // Keyword (substituting, exact match)                                 | 1100
 // Search Primary Provider (past query in history older than 2 days)   | 1050--
@@ -89,8 +93,10 @@
 // URL input type:
 // --------------------------------------------------------------------|-----
 // Keyword (non-substituting or in keyword UI mode, exact match)       | 1500
+// Extension App (exact match)                                         | 1425
 // HistoryURL (exact or inline autocomplete match)                     | 1400
 // HistoryURL (what you typed)                                         | 1200
+// Extension App (inexact match)                                       | 1175*~
 // Keyword (substituting, exact match)                                 | 1100
 // HistoryURL (inexact match)                                          |  900++
 // Search Primary Provider (what you typed)                            |  850
@@ -108,9 +114,11 @@
 // --------------------------------------------------------------------|-----
 // Keyword (non-substituting or in keyword UI mode, exact match)       | 1500
 // Keyword (substituting, exact match)                                 | 1450
+// Extension App (exact match)                                         | 1425
 // HistoryURL (exact or inline autocomplete match)                     | 1400
 // Search Primary Provider (past query in history within 2 days)       | 1399**
 // Search Primary Provider (what you typed)                            | 1300
+// Extension App (inexact match)                                       | 1175*~
 // Search Primary Provider (past query in history older than 2 days)   | 1050--
 // HistoryContents (any match in title of starred page)                | 1000++
 // HistoryURL (inexact match)                                          |  900++
@@ -151,6 +159,8 @@
 //     450 points @ two weeks)
 // --: relevance score falls off over two days (discounted 99 points after two

[Peter Kasting, 2011/04/04 19:35:32]

Nit: While you're here, This line was supposed to be "**" instead of "--".

[Finnur, 2011/04/05 15:50:24]

Done.

 //     days).
+// *~: Partial matches get a score on a sliding scale from 800-1175 based on
+//     how many letters match (5 letters and above get 1175).
 
 class AutocompleteController;
 class AutocompleteControllerDelegate;