Add DataReductionProxy IPC to determine if the Data Reduction Proxy was used.

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index d3e8e0d53116cdbc0d0945946929898bfcae7d4e..636aeb22c5c9dd165544ffb844580e9ecafe7209 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -42,6 +42,8 @@
 #include "chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.h"
 #include "chrome/browser/nacl_host/nacl_browser_delegate_impl.h"
 #include "chrome/browser/net/chrome_net_log.h"
+#include "chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.h"
+#include "chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings_factory.h"
 #include "chrome/browser/notifications/desktop_notification_service.h"
 #include "chrome/browser/notifications/desktop_notification_service_factory.h"
 #include "chrome/browser/notifications/platform_notification_service_impl.h"
@@ -99,6 +101,7 @@
 #include "components/content_settings/core/browser/host_content_settings_map.h"
 #include "components/content_settings/core/common/content_settings.h"
 #include "components/content_settings/core/common/permission_request_id.h"
+#include "components/data_reduction_proxy/content/browser/data_reduction_proxy_message_filter.h"
 #include "components/dom_distiller/core/url_constants.h"
 #include "components/google/core/browser/google_util.h"
 #include "components/metrics/client_info.h"
@@ -937,6 +940,13 @@ void ChromeContentBrowserClient::RenderProcessWillLaunch(
   if (switches::IsEnableAccountConsistency())
     host->AddFilter(new PrincipalsMessageFilter(id));
 
+  DataReductionProxyChromeSettings* data_reduction_proxy_settings =
+      DataReductionProxyChromeSettingsFactory::GetForBrowserContext(profile);
+  if (data_reduction_proxy_settings) {
+    host->AddFilter(new data_reduction_proxy::DataReductionProxyMessageFilter(
+        data_reduction_proxy_settings));
+  }
+
   host->Send(new ChromeViewMsg_SetIsIncognitoProcess(
       profile->IsOffTheRecord()));