Report frequency of single page app navigations to UMA

third_party/WebKit/Source/core/loader/FrameFetchContext.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 104 matching lines @@
       // Mutates the policy for POST requests to avoid form resubmission.
       return method == RequestMethod::kIsPost
                  ? WebCachePolicy::kReturnCacheDataDontLoad
                  : WebCachePolicy::kReturnCacheDataElseLoad;
     case kFrameLoadTypeReload:
       return resource_type == ResourceType::kIsMainResource
                  ? WebCachePolicy::kValidatingCacheData
                  : WebCachePolicy::kUseProtocolCachePolicy;
     case kFrameLoadTypeReloadBypassingCache:
       return WebCachePolicy::kBypassingCache;
+    case kFrameLoadTypeCount: {
+    }
   }
   NOTREACHED();
   return WebCachePolicy::kUseProtocolCachePolicy;
 }
 
 // Determines WebCachePolicy for |frame|. This WebCachePolicy should be a base
 // policy to consider one of each resource belonging to the frame, and should
 // not count resource specific conditions in.
 // TODO(toyoshim): Remove |resourceType| to realize the design described above.
 // See also comments in resourceRequestCachePolicy().
@@ skipping 717 matching lines @@
   document_ = nullptr;
 }
 
 DEFINE_TRACE(FrameFetchContext) {
   visitor->Trace(document_loader_);
   visitor->Trace(document_);
   BaseFetchContext::Trace(visitor);
 }
 
 }  // namespace blink