Implement frame attribution (FrameBlamer)

content/renderer/web_blame_context_impl.cc

Index: content/renderer/web_blame_context_impl.cc
diff --git a/content/renderer/web_blame_context_impl.cc b/content/renderer/web_blame_context_impl.cc
new file mode 100644
index 0000000000000000000000000000000000000000..1eb7a11b365322eb39f190854d7e04fbe25a1d60
--- /dev/null
+++ b/content/renderer/web_blame_context_impl.cc
@@ -0,0 +1,22 @@
+// 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/renderer/web_blame_context_impl.h"
+
+#include "base/debug/blame_context.h"
+
+namespace content {
+
+WebBlameContextImpl::WebBlameContextImpl(base::debug::BlameContextBase* context)
+    : context_(context) {}
+
+void WebBlameContextImpl::enter() {
+  context_->Enter();
+}
+
+void WebBlameContextImpl::leave() {
+  context_->Leave();
+}
+
+}  // namespace content