Instant: Don't allow the page to set suggestions inappropriately.

chrome/browser/ui/search/instant_extended_browsertest.cc

 // Copyright 2013 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 <sstream>
 
 #include "base/prefs/pref_service.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
 #include "base/utf_string_conversions.h"
@@ skipping 1411 matching lines @@
   ASSERT_NO_FATAL_FAILURE(SetupInstant(browser()));
 
   EXPECT_EQ(instant_url(), instant()->ntp_->contents()->GetURL());
 
   // The second argument says to use only the local overlay.
   instant()->SetInstantEnabled(false, true);
 
   EXPECT_EQ(GURL(chrome::kChromeSearchLocalNtpUrl),
             instant()->ntp_->contents()->GetURL());
 }
+
+// Test that suggestions are not accepted when unexpected.
+IN_PROC_BROWSER_TEST_F(InstantExtendedTest, DeniesUnexpectedSuggestions) {
+  ASSERT_NO_FATAL_FAILURE(SetupInstant(browser()));
+  FocusOmniboxAndWaitForInstantExtendedSupport();
+  SetOmniboxTextAndWaitForOverlayToShow("chip");
+  SendDownArrow();
+
+  EXPECT_EQ("result 1", GetOmniboxText());
+  EXPECT_EQ(ASCIIToUTF16(""), GetGrayText());
+
+  // Make the page send an unexpected suggestion.
+  EXPECT_TRUE(ExecuteScript("suggestion = 'chippies';"
+                            "handleOnChange();"));
+
+  // Verify that the suggestion is ignored.
+  EXPECT_EQ("result 1", GetOmniboxText());
+  EXPECT_EQ(ASCIIToUTF16(""), GetGrayText());
+}