Don't call AutocompleteInput::Parse() on a background thread, part 2.

chrome/browser/autocomplete/autocomplete_input.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/autocomplete_input.h"
 
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/external_protocol/external_protocol_handler.h"
 #include "chrome/browser/profiles/profile_io_data.h"
@@ skipping 112 matching lines @@
   return std::string();
 }
 
 // static
 AutocompleteInput::Type AutocompleteInput::Parse(
     const base::string16& text,
     const base::string16& desired_tld,
     url::Parsed* parts,
     base::string16* scheme,
     GURL* canonicalized_url) {
+  // NOT FOR COMMIT: Remove this once trybots make it clear no callers call this

[Mark P, 2014/06/19 21:35:14]

Remember me.

+  // on a non-UI thread.
+  CHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI) ||
+      !content::BrowserThread::IsThreadInitialized(content::BrowserThread::UI));
+
   size_t first_non_white = text.find_first_not_of(base::kWhitespaceUTF16, 0);
   if (first_non_white == base::string16::npos)
     return metrics::OmniboxInputType::INVALID;  // All whitespace.
 
   if (text[first_non_white] == L'?') {
     // If the first non-whitespace character is a '?', we magically treat this
     // as a query.
     return metrics::OmniboxInputType::FORCED_QUERY;
   }
 
@@ skipping 390 matching lines @@
   current_page_classification_ = AutocompleteInput::INVALID_SPEC;
   type_ = metrics::OmniboxInputType::INVALID;
   parts_ = url::Parsed();
   scheme_.clear();
   canonicalized_url_ = GURL();
   prevent_inline_autocomplete_ = false;
   prefer_keyword_ = false;
   allow_exact_keyword_match_ = false;
   want_asynchronous_matches_ = true;
 }