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 be00c5c456562636282576bdfb0288ac96e48f09..87cf210f5fb2e2e06140f2c09b2121a41346334a 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -43,6 +43,8 @@
 #include "chrome/browser/metrics/rappor/sampling.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"
@@ -100,6 +102,7 @@
 #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"
@@ -938,6 +941,13 @@ 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()));