The component update checks should include the amount of installed memory.

chrome/browser/component_updater/component_updater_utils.cc

 // Copyright 2013 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.
 
 #include "chrome/browser/component_updater/component_updater_utils.h"
 
+#include <cmath>
+
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/guid.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/sys_info.h"
 #include "base/win/windows_version.h"
 #include "chrome/browser/component_updater/component_updater_service.h"
 #include "chrome/browser/component_updater/crx_update_item.h"
 #include "chrome/browser/omaha_query_params/omaha_query_params.h"
 #include "chrome/common/chrome_version_info.h"
 #include "extensions/common/extension.h"
 #include "net/base/load_flags.h"
 #include "net/url_request/url_fetcher.h"
 #include "net/url_request/url_request_context_getter.h"
 #include "net/url_request/url_request_status.h"
 
 namespace component_updater {
 
+namespace {
+
+// Returns the amount of physical memory in GB, rounded to the nearest GB.
+int GetPhysicalMemoryGB() {
+  const double kOneGB = 1024 * 1024 * 1024;
+  const int64 phys_mem = base::SysInfo::AmountOfPhysicalMemory();
+  return static_cast<int>(std::floor(0.5 + phys_mem / kOneGB));
+}
+
+}  // namespace
+
 std::string BuildProtocolRequest(const std::string& request_body,
                                  const std::string& additional_attributes) {
   const std::string prod_id(chrome::OmahaQueryParams::GetProdIdString(
       chrome::OmahaQueryParams::CHROME));
   const chrome::VersionInfo chrome_version_info;
   const std::string chrome_version(chrome_version_info.Version());
 
   std::string request(
       "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
       "<request protocol=\"3.0\" ");
@@ skipping 18 matching lines @@
       chrome::OmahaQueryParams::GetArch(),           // "arch"
       chrome::OmahaQueryParams::GetNaclArch());      // "nacl_arch"
 #if defined(OS_WIN)
   const bool is_wow64(base::win::OSInfo::GetInstance()->wow64_status() ==
                       base::win::OSInfo::WOW64_ENABLED);
   if (is_wow64)
     base::StringAppendF(&request, " wow64=\"1\"");
 #endif
   base::StringAppendF(&request, ">");
 
+  // HW platform information.
+  base::StringAppendF(&request,
+                      "<hw physmemory=\"%d\"/>",
+                      GetPhysicalMemoryGB());  // "physmem" in GB.
+
   // OS version and platform information.
   base::StringAppendF(
       &request,
       "<os platform=\"%s\" version=\"%s\" arch=\"%s\"/>",
       chrome::VersionInfo().OSType().c_str(),                  // "platform"
       base::SysInfo().OperatingSystemVersion().c_str(),        // "version"
       base::SysInfo().OperatingSystemArchitecture().c_str());  // "arch"
 
   // The actual payload of the request.
   base::StringAppendF(&request, "%s</request>", request_body.c_str());
@@ skipping 87 matching lines @@
   DCHECK(extensions::Extension::IdIsValid(id));
   return id;
 }
 
 std::string GetCrxComponentID(const CrxComponent& component) {
   return HexStringToID(StringToLowerASCII(
       base::HexEncode(&component.pk_hash[0], component.pk_hash.size() / 2)));
 }
 
 }  // namespace component_updater