Add support for sparse histograms to WebKitPlatformSupportImpl

webkit/glue/webkitplatformsupport_impl.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 WEBKIT_PLATFORM_SUPPORT_IMPL_H_
 #define WEBKIT_PLATFORM_SUPPORT_IMPL_H_
 
 #include "base/compiler_specific.h"
 #include "base/debug/trace_event.h"
 #include "base/platform_file.h"
@@ skipping 57 matching lines @@
       const WebKit::WebURL& url, WebKit::WebString& mimetype,
       WebKit::WebString& charset);
   virtual WebKit::WebURLError cancelledError(const WebKit::WebURL& url) const;
   virtual void getPluginList(bool refresh, WebKit::WebPluginListBuilder*);
   virtual void decrementStatsCounter(const char* name);
   virtual void incrementStatsCounter(const char* name);
   virtual void histogramCustomCounts(
     const char* name, int sample, int min, int max, int bucket_count);
   virtual void histogramEnumeration(
     const char* name, int sample, int boundary_value);
+  virtual void histogramSparse(const char* name, int sample);
   virtual const unsigned char* getTraceCategoryEnabledFlag(
       const char* category_name);
   virtual long* getTraceSamplingState(const unsigned thread_bucket);
   virtual void addTraceEvent(
       char phase,
       const unsigned char* category_group_enabled,
       const char* name,
       unsigned long long id,
       int num_args,
       const char** arg_names,
@@ skipping 58 matching lines @@
   base::OneShotTimer<WebKitPlatformSupportImpl> shared_timer_;
   void (*shared_timer_func_)();
   double shared_timer_fire_time_;
   bool shared_timer_fire_time_was_set_while_suspended_;
   int shared_timer_suspended_;  // counter
 };
 
 }  // namespace webkit_glue
 
 #endif  // WEBKIT_PLATFORM_SUPPORT_IMPL_H_