[Mojo-Loading] Implement "Site Isolation Stats Gathering" feature

content/child/url_response_body_consumer.cc

Index: content/child/url_response_body_consumer.cc
diff --git a/content/child/url_response_body_consumer.cc b/content/child/url_response_body_consumer.cc
index 1e6859cc784b8571d1513a9d7e2d07be4a76e8c1..9e838796628a4b63a29c4a97891758a60b1278be 100644
--- a/content/child/url_response_body_consumer.cc
+++ b/content/child/url_response_body_consumer.cc
@@ -9,6 +9,7 @@
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "content/child/resource_dispatcher.h"
+#include "content/child/site_isolation_stats_gatherer.h"
 #include "content/common/resource_messages.h"
 #include "content/common/resource_request_completion_status.h"
 #include "content/public/child/request_peer.h"
@@ -143,6 +144,16 @@ void URLResponseBodyConsumer::OnReadable(MojoResult unused) {
     ResourceDispatcher::PendingRequestInfo* request_info =
         resource_dispatcher_->GetPendingRequestInfo(request_id_);
     DCHECK(request_info);
+
+    // Check whether this response data is compliant with our cross-site

[yhirano, 2017/01/19 10:35:55]

This code is copied from ResourceDispatcher::OnReceivedData.

+    // document blocking policy. We only do this for the first chunk of data.
+    if (request_info->site_isolation_metadata.get()) {
+      SiteIsolationStatsGatherer::OnReceivedFirstChunk(
+          request_info->site_isolation_metadata,
+          static_cast<const char*>(buffer), available);
+      request_info->site_isolation_metadata.reset();
+    }
+
     request_info->peer->OnReceivedData(base::MakeUnique<ReceivedData>(
         static_cast<const char*>(buffer), available, this));
   }