Assume all providers may give zero suggest responses.

components/omnibox/keyword_provider_unittest.cc

 // Copyright 2014 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/command_line.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/metrics/proto/omnibox_event.pb.h"
 #include "components/omnibox/autocomplete_match.h"
 #include "components/omnibox/autocomplete_scheme_classifier.h"
@@ skipping 79 matching lines @@
 void KeywordProviderTest::RunTest(TestData<ResultType>* keyword_cases,
                                   int num_cases,
                                   ResultType AutocompleteMatch::* member) {
   ACMatches matches;
   for (int i = 0; i < num_cases; ++i) {
     SCOPED_TRACE(keyword_cases[i].input);
     AutocompleteInput input(keyword_cases[i].input, base::string16::npos,
                             std::string(), GURL(),
                             metrics::OmniboxEventProto::INVALID_SPEC, true,
                             false, true, true, TestingSchemeClassifier());
-    kw_provider_->Start(input, false);
+    kw_provider_->Start(input, false, false);
     EXPECT_TRUE(kw_provider_->done());
     matches = kw_provider_->matches();
     ASSERT_EQ(keyword_cases[i].num_results, matches.size());
     for (size_t j = 0; j < matches.size(); ++j) {
       EXPECT_EQ(keyword_cases[i].output[j].member, matches[j].*member);
       EXPECT_EQ(keyword_cases[i].output[j].allowed_to_be_default_match,
                 matches[j].allowed_to_be_default_match);
     }
   }
 }
@@ skipping 249 matching lines @@
   TestData<GURL> url_cases[] = {
     { ASCIIToUTF16("a 1 2 3"), 3,
       { { GURL("aa.com?a=b&foo=1+2+3"), false },
         { GURL("bogus URL 1+2+3"), false },
         { GURL("http://aaaa/?aaaa=1&b=1+2+3&c"), false } } },
   };
 
   RunTest<GURL>(url_cases, arraysize(url_cases),
                 &AutocompleteMatch::destination_url);
 }
+
+TEST_F(KeywordProviderTest, DoesNotProvideMatchesOnFocus) {
+  AutocompleteInput input(ASCIIToUTF16("aaa"), base::string16::npos,
+                          std::string(), GURL(),
+                          metrics::OmniboxEventProto::INVALID_SPEC, true,
+                          false, true, true, TestingSchemeClassifier());
+  kw_provider_->Start(input, false, true);
+  ASSERT_TRUE(kw_provider_->matches().empty());
+}