Collect separate V8 histograms for Top10 non-Google sites

content/renderer/render_thread_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 CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 #define CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 364 matching lines @@
     // RenderView navigated, and |view_count| is the number of RenderViews in
     // this process.
     void RenderViewNavigatedToHost(const std::string& host, size_t view_count);
 
     // Used for customizing some histograms if all RenderViews share the same
     // host. Returns the current custom histogram name to use for
     // |histogram_name|, or |histogram_name| if it shouldn't be customized.
     std::string ConvertToCustomHistogramName(const char* histogram_name) const;
 
    private:
+    FRIEND_TEST_ALL_PREFIXES(RenderThreadImplUnittest,
+                             IdentifyAlexaTop10NonGoogleSite);
     friend class RenderThreadImplUnittest;
 
+    // Converts a host name to a suffix for histograms
+    std::string HostToCustomHistogramSuffix(const std::string& host);
+
+    // Helper function to identify a certain set of top pages
+    bool IsAlexaTop10NonGoogleSite(const std::string& host);
+
     // Used for updating the information on which is the common host which all
     // RenderView's share (if any). If there is no common host, this function is
     // called with an empty string.
     void SetCommonHost(const std::string& host);
 
     // The current common host of the RenderViews; empty string if there is no
     // common host.
     std::string common_host_;
     // The corresponding suffix.
     std::string common_host_histogram_suffix_;
@@ skipping 269 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(RenderThreadImpl);
 };
 
 #if defined(COMPILER_MSVC)
 #pragma warning(pop)
 #endif
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_THREAD_IMPL_H_