Implement a simple Extension App Omnibox provider.

chrome/browser/autocomplete/autocomplete_browsertest.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/format_macros.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/autocomplete/autocomplete.h"
 #include "chrome/browser/autocomplete/autocomplete_edit.h"
 #include "chrome/browser/autocomplete/autocomplete_edit_view.h"
@@ skipping 97 matching lines @@
   {
     autocomplete_controller->Start(
         ASCIIToUTF16("chrome"), string16(), true, false, true,
         AutocompleteInput::SYNCHRONOUS_MATCHES);
 
     EXPECT_TRUE(autocomplete_controller->done());
     EXPECT_TRUE(location_bar->GetInputString().empty());
     EXPECT_TRUE(location_bar->location_entry()->GetText().empty());
     EXPECT_TRUE(location_bar->location_entry()->IsSelectAll());
     const AutocompleteResult& result = autocomplete_controller->result();
-    ASSERT_EQ(1U, result.size()) << AutocompleteResultAsString(result);
+    // We get two matches because we have a provider for extension apps and the
+    // Chrome Web Store is a built-in Extension app. For this test, we only care
+    // about the other match existing.
+    ASSERT_GE(result.size(), 1U) << AutocompleteResultAsString(result);
     AutocompleteMatch match = result.match_at(0);
     EXPECT_EQ(AutocompleteMatch::SEARCH_WHAT_YOU_TYPED, match.type);
     EXPECT_FALSE(match.deletable);
   }
 
   {
     location_bar->Revert();
 
     EXPECT_TRUE(location_bar->GetInputString().empty());
     EXPECT_EQ(UTF8ToUTF16(chrome::kAboutBlankURL),
@@ skipping 109 matching lines @@
     EXPECT_EQ(ASCIIToUTF16("   ?foo"),
               location_bar->location_entry()->GetText());
 
     size_t selection_start, selection_end;
     location_bar->location_entry()->GetSelectionBounds(&selection_start,
                                                        &selection_end);
     EXPECT_EQ(4U, std::min(selection_start, selection_end));
     EXPECT_EQ(7U, std::max(selection_start, selection_end));
   }
 }