Make a copy of PageClassification enum outside the metrics code

chrome/browser/autocomplete/autocomplete_input.h

 // 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.
 
 #ifndef CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_INPUT_H_
 #define CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_INPUT_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 26 matching lines @@
     // higher-level "synchronous" query.
     BEST_MATCH,
 
     // Only synchronous matches should be returned.
     SYNCHRONOUS_MATCHES,
 
     // All matches should be fetched.
     ALL_MATCHES,
   };
 
+  // The type of page currently displayed.
+  // Note: when adding an element to this enum, please add it at the end
+  // and update omnibox_event.proto::PageClassification and
+  // omnibox_edit_model.cc::ClassifyPage() too.
+  enum PageClassification {
+    INVALID_SPEC = 0,   // invalid URI; shouldn't happen
+    NEW_TAB_PAGE = 1,   // chrome://newtab/
+    // Note that chrome://newtab/ doesn't have to be the built-in
+    // version; it could be replaced by an extension.
+    BLANK = 2,          // about:blank
+    HOMEPAGE = 3,       // user switched settings to "open this page" mode.
+    // Note that if the homepage is set to the new tab page or about blank,
+    // then we'll classify the web page into those categories, not HOMEPAGE.
+    OTHER = 4,          // everything not included somewhere else on this list
+    INSTANT_NEW_TAB_PAGE = 5,  // new tab page rendered by Instant
+    // The user is on a search result page that's doing search term
+    // replacement, meaning the search terms should've appeared in the omnibox
+    // before the user started editing it, not the URL of the page.
+    SEARCH_RESULT_PAGE_DOING_SEARCH_TERM_REPLACEMENT = 6
+  };
+
   AutocompleteInput();
   // |text| and |cursor_position| represent the input query and location of
   // the cursor with the query respectively.  |cursor_position| may be set to
   // string16::npos if the input |text| doesn't come directly from the user's
   // typing.
   //
   // |desired_tld| is the user's desired TLD, if one is not already present in
   // the text to autocomplete.  When this is non-empty, it also implies that
   // "www." should be prepended to the domain where possible. The |desired_tld|
   // should not contain a leading '.' (use "com" instead of ".com").
@@ skipping 131 matching lines @@
   url_parse::Parsed parts_;
   string16 scheme_;
   GURL canonicalized_url_;
   bool prevent_inline_autocomplete_;
   bool prefer_keyword_;
   bool allow_exact_keyword_match_;
   MatchesRequested matches_requested_;
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_INPUT_H_