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 1630 matching lines @@
   // lose focus. Close the popup explicitly, to workaround test/toolkit issues.
   ui_test_utils::ClickOnView(browser(), VIEW_ID_TOOLBAR);
   omnibox()->CloseOmniboxPopup();
   EXPECT_FALSE(HasTemporaryText());
 
   EXPECT_EQ(overlay, instant()->GetOverlayContents());
   EXPECT_TRUE(UpdateSearchState(overlay));
   EXPECT_EQ(0, on_change_calls_);
   EXPECT_EQ(0, on_native_suggestions_calls_);
 }
+
+// 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());
+}