Move history API out of experimental. Allow extensions to override history page.

chrome/common/page_transition_types.h

-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 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_COMMON_PAGE_TRANSITION_TYPES_H__
 #define CHROME_COMMON_PAGE_TRANSITION_TYPES_H__
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 
 // This class is for scoping only.
@@ skipping 75 matching lines @@
     // wikipedia the generated url has a transition qualifer of KEYWORD, and
     // TemplateURLModel generates a visit for 'wikipedia.org' with a transition
     // type of KEYWORD_GENERATED.
     KEYWORD = 9,
 
     // Corresponds to a visit generated for a keyword. See description of
     // KEYWORD for more details.
     KEYWORD_GENERATED = 10,
 
     // ADDING NEW CORE VALUE? Be sure to update the LAST_CORE and CORE_MASK
-    // values below.
+    // values below.  Also update CoreTransitionString().
     LAST_CORE = KEYWORD_GENERATED,
     CORE_MASK = 0xFF,
 
     // Qualifiers
     // Any of the core values above can be augmented by one or more qualifiers.
     // These qualifiers further define the transition.
 
     // The beginning of a navigation chain.
     CHAIN_START = 0x10000000,
 
@@ skipping 47 matching lines @@
 
   // Simplifies the provided transition by removing any qualifier
   static Type StripQualifier(Type type) {
     return static_cast<Type>(type & ~QUALIFIER_MASK);
   }
 
   // Return the qualifier
   static int32 GetQualifier(Type type) {
     return type & QUALIFIER_MASK;
   }
+
+  // Return a string version of the core type values.
+  static const char* CoreTransitionString(Type type);
 };
 
 #endif  // CHROME_COMMON_PAGE_TRANSITION_TYPES_H__