Introduce browser side FrameTreeNodeBlameContext

content/browser/frame_host/frame_tree_node_blame_context.h

+// 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.
+
+#ifndef CONTENT_BROWSER_FRAME_HOST_FRAME_TREE_NODE_BLAME_CONTEXT_H
+#define CONTENT_BROWSER_FRAME_HOST_FRAME_TREE_NODE_BLAME_CONTEXT_H
+
+#include "base/macros.h"
+#include "base/trace_event/blame_context.h"
+
+namespace base {
+namespace trace_event {
+class TracedValue;
+}
+}
+
+namespace content {
+
+class FrameTreeNode;
+
+class FrameTreeNodeBlameContext : public base::trace_event::BlameContext {
+ public:
+  FrameTreeNodeBlameContext(FrameTreeNode* node);
+  ~FrameTreeNodeBlameContext() override;
+
+  // Before taking a snapshot, call this function to make sure all arguments
+  // are up-to-date.
+  // TODO(xiaochengh): Get rid of this function by somehow storing the node.
+  void UpdateArguments(FrameTreeNode* node);
+  void ClearArguments();
+
+ private:
+  void AsValueInto(base::trace_event::TracedValue* value) override;
+
+  int process_id_;
+  int routing_id_;
+  std::string url_;
+
+  DISALLOW_COPY_AND_ASSIGN(FrameTreeNodeBlameContext);
+};
+
+}  // content
+
+#endif  // CONTENT_BROWSER_FRAME_HOST_FRAME_TREE_NODE_BLAME_CONTEXT_H