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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROME_BROWSER_PRERENDER_PRERENDER_ORIGIN_H_
      6 #define CHROME_BROWSER_PRERENDER_PRERENDER_ORIGIN_H_
      7 
      8 namespace prerender {
      9 
     10 // Origin indicates what caused the prerender.
     11 // NOTE: New values need to be appended, since they are used in histograms.
     12 enum Origin {
     13   // Obsolete: ORIGIN_LINK_REL_PRERENDER = 0,
     14   // Obsolete: ORIGIN_OMNIBOX_ORIGINAL = 1,
     15   ORIGIN_GWS_PRERENDER = 2,
     16   // Obsolete: ORIGIN_OMNIBOX_CONSERVATIVE = 3,
     17   // Obsolete: ORIGIN_OMNIBOX_EXACT = 4,
     18   ORIGIN_OMNIBOX = 5,
     19   ORIGIN_NONE = 6,
     20   ORIGIN_LINK_REL_PRERENDER_SAMEDOMAIN = 7,
     21   ORIGIN_LINK_REL_PRERENDER_CROSSDOMAIN = 8,
     22   ORIGIN_LOCAL_PREDICTOR = 9,
     23   ORIGIN_EXTERNAL_REQUEST = 10,
     24   ORIGIN_INSTANT = 11,
     25   ORIGIN_MAX,
     26 };
     27 
     28 // Return a human-readable name for |origin|.
     29 const char* NameFromOrigin(Origin origin);
     30 
     31 }  // namespace prerender
     32 
     33 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_ORIGIN_H_
     34