Make reprioritization IPC batch rather than per-request.

content/common/resource_priority_change_info.cc

Index: content/common/resource_priority_change_info.cc
diff --git a/content/common/resource_priority_change_info.cc b/content/common/resource_priority_change_info.cc
new file mode 100644
index 0000000000000000000000000000000000000000..57150b3f78f87a782ef4e7e2267eccd85bc62723
--- /dev/null
+++ b/content/common/resource_priority_change_info.cc
@@ -0,0 +1,19 @@
+// Copyright 2016 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 "content/common/resource_priority_change_info.h"
+
+namespace content {
+
+ResourcePriorityChangeInfo::ResourcePriorityChangeInfo() {}
+ResourcePriorityChangeInfo::ResourcePriorityChangeInfo(
+    int request_id, net::RequestPriority priority, int intra_priority_value)
+    : request_id(request_id),
+      priority(priority),
+      intra_priority_value(intra_priority_value) {}
+
+ResourcePriorityChangeInfo::~ResourcePriorityChangeInfo() {}
+
+}  // namespace content
+