fix about:memory and memory histograms to show extensions more clearly

chrome/browser/memory_details.h

 // 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_BROWSER_MEMORY_DETAILS_H_
 #define CHROME_BROWSER_MEMORY_DETAILS_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 14 matching lines @@
   // The working set information.
   base::WorkingSetKBytes working_set;
   // The committed bytes.
   base::CommittedKBytes committed;
   // The process version
   string16 version;
   // The process product name.
   string16 product_name;
   // The number of processes which this memory represents.
   int num_processes;
-  // A process is a diagnostics process if it is rendering
-  // about:xxx information.
+  // A process is a diagnostics process if it is rendering about:memory.
+  // Mark this specially so that it can avoid counting it in its own
+  // results.
   bool is_diagnostics;
   // If this is a child process of Chrome, what type (i.e. plugin) it is.
   ChildProcessInfo::ProcessType type;
+  // If this is a renderer process, what type it is.
+  ChildProcessInfo::RendererProcessType renderer_type;
   // A collection of titles used, i.e. for a tab it'll show all the page titles.
   std::vector<string16> titles;
 };
 
 typedef std::vector<ProcessMemoryInformation> ProcessMemoryInformationList;
 
 // Browser Process Information.
 struct ProcessData {
   ProcessData();
   ProcessData(const ProcessData& rhs);
@@ skipping 91 matching lines @@
 
   // Returns a pointer to the ProcessData structure for Chrome.
   ProcessData* ChromeBrowser();
 
   std::vector<ProcessData> process_data_;
 
   DISALLOW_COPY_AND_ASSIGN(MemoryDetails);
 };
 
 #endif  // CHROME_BROWSER_MEMORY_DETAILS_H_