Assume all providers may give zero suggest responses.

chrome/browser/autocomplete/history_quick_provider_unittest.cc

 // Copyright (c) 2012 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 "chrome/browser/autocomplete/history_quick_provider.h"
 
 #include <algorithm>
 #include <functional>
 #include <set>
 #include <string>
@@ skipping 274 matching lines @@
     std::vector<std::string> expected_urls,
     bool can_inline_top_result,
     base::string16 expected_fill_into_edit,
     base::string16 expected_autocompletion) {
   SCOPED_TRACE(text);  // Minimal hint to query being run.
   base::MessageLoop::current()->RunUntilIdle();
   AutocompleteInput input(text, cursor_position, std::string(), GURL(),
                           metrics::OmniboxEventProto::INVALID_SPEC,
                           prevent_inline_autocomplete, false, true, true,
                           ChromeAutocompleteSchemeClassifier(profile_.get()));
-  provider_->Start(input, false);
+  provider_->Start(input, false, false);
   EXPECT_TRUE(provider_->done());
 
   ac_matches_ = provider_->matches();
 
   // We should have gotten back at most AutocompleteProvider::kMaxMatches.
   EXPECT_LE(ac_matches_.size(), AutocompleteProvider::kMaxMatches);
 
   // If the number of expected and actual matches aren't equal then we need
   // test no further, but let's do anyway so that we know which URLs failed.
   EXPECT_EQ(expected_urls.size(), ac_matches_.size());
@@ skipping 401 matching lines @@
           ASCIIToUTF16("anotherengine.com/?q=thequery"), base::string16());
 
   // A search results page should not be returned when typing the engine URL.
   expected_urls.clear();
   expected_urls.push_back("http://testsearch.com/");
   RunTest(ASCIIToUTF16("testsearch"), false, expected_urls, true,
           ASCIIToUTF16("testsearch.com"),
                     ASCIIToUTF16(".com"));
 }
 
+TEST_F(HistoryQuickProviderTest, DoesNotProvideMatchesOnFocus) {
+  AutocompleteInput input(ASCIIToUTF16("popularsite"), base::string16::npos,
+                          std::string(), GURL(),
+                          metrics::OmniboxEventProto::INVALID_SPEC,
+                          false, false, true, true,
+                          ChromeAutocompleteSchemeClassifier(profile_.get()));
+  provider_->Start(input, false, true);
+  EXPECT_TRUE(provider_->matches().empty());
+}
+
 // HQPOrderingTest -------------------------------------------------------------
 
 TestURLInfo ordering_test_db[] = {
   {"http://www.teamliquid.net/tlpd/korean/games/21648_bisu_vs_iris", "", 6, 3,
       256},
   {"http://www.amazon.com/", "amazon.com: online shopping for electronics, "
       "apparel, computers, books, dvds & more", 20, 20, 10},
   {"http://www.teamliquid.net/forum/viewmessage.php?topic_id=52045&"
       "currentpage=83", "google images", 6, 6, 0},
   {"http://www.tempurpedic.com/", "tempur-pedic", 7, 7, 0},
@@ skipping 48 matching lines @@
 
 TEST_F(HQPOrderingTest, TEAMatch) {
   std::vector<std::string> expected_urls;
   expected_urls.push_back("http://www.teamliquid.net/");
   expected_urls.push_back("http://www.teamliquid.net/tlpd");
   expected_urls.push_back("http://www.teamliquid.net/tlpd/korean/players");
   RunTest(ASCIIToUTF16("tea"), false, expected_urls, true,
           ASCIIToUTF16("www.teamliquid.net"),
                  ASCIIToUTF16("mliquid.net"));
 }