Add histogram for image errors.

content/browser/loader/resource_dispatcher_host_impl.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.
 
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
 
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
 
 #include <set>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/debug/alias.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "base/metrics/histogram.h"
+#include "base/metrics/sparse_histogram.h"
 #include "base/shared_memory.h"
 #include "base/stl_util.h"
 #include "base/third_party/dynamic_annotations/dynamic_annotations.h"
 #include "content/browser/appcache/chrome_appcache_service.h"
 #include "content/browser/cert_store_impl.h"
 #include "content/browser/child_process_security_policy_impl.h"
 #include "content/browser/cross_site_request_manager.h"
 #include "content/browser/download/download_resource_handler.h"
 #include "content/browser/download/save_file_manager.h"
 #include "content/browser/download/save_file_resource_handler.h"
@@ skipping 703 matching lines @@
           render_process_id, render_view_id, base::Passed(&detail)));
 }
 
 void ResourceDispatcherHostImpl::DidFinishLoading(ResourceLoader* loader) {
   ResourceRequestInfo* info = loader->GetRequestInfo();
 
   // Record final result of all resource loads.
   if (info->GetResourceType() == ResourceType::MAIN_FRAME) {
     // This enumeration has "3" appended to its name to distinguish it from
     // older versions.
-    UMA_HISTOGRAM_CUSTOM_ENUMERATION(
+    UMA_HISTOGRAM_SPARSE_SLOWLY(
         "Net.ErrorCodesForMainFrame3",
-        -loader->request()->status().error(),
-        base::CustomHistogram::ArrayToCustomRanges(
-            kAllNetErrorCodes, arraysize(kAllNetErrorCodes)));
+        -loader->request()->status().error());
 
     if (loader->request()->url().SchemeIsSecure() &&
         loader->request()->url().host() == "www.google.com") {
-      UMA_HISTOGRAM_CUSTOM_ENUMERATION(
+      UMA_HISTOGRAM_SPARSE_SLOWLY(
           "Net.ErrorCodesForHTTPSGoogleMainFrame2",
-          -loader->request()->status().error(),
-          base::CustomHistogram::ArrayToCustomRanges(
-              kAllNetErrorCodes, arraysize(kAllNetErrorCodes)));
+          -loader->request()->status().error());
     }
   } else {
+    if (info->GetResourceType() == ResourceType::IMAGE) {
+      UMA_HISTOGRAM_SPARSE_SLOWLY(
+          "Net.ErrorCodesForImages",
+          -loader->request()->status().error());
+    }
     // This enumeration has "2" appended to distinguish it from older versions.
-    UMA_HISTOGRAM_CUSTOM_ENUMERATION(
+    UMA_HISTOGRAM_SPARSE_SLOWLY(
         "Net.ErrorCodesForSubresources2",
-        -loader->request()->status().error(),
-        base::CustomHistogram::ArrayToCustomRanges(
-            kAllNetErrorCodes, arraysize(kAllNetErrorCodes)));
+        -loader->request()->status().error());
   }
 
   // Destroy the ResourceLoader.
   RemovePendingRequest(info->GetChildID(), info->GetRequestID());
 }
 
 // static
 bool ResourceDispatcherHostImpl::RenderViewForRequest(
     const net::URLRequest* request,
     int* render_process_id,
@@ skipping 1016 matching lines @@
   DelegateMap::iterator it = delegate_map_.find(id);
   DCHECK(it->second->HasObserver(delegate));
   it->second->RemoveObserver(delegate);
   if (it->second->size() == 0) {
     delete it->second;
     delegate_map_.erase(it);
   }
 }
 
 }  // namespace content