[devtools] Add DOMSnapshot domain for dom+layout+style snapshots.

third_party/WebKit/Source/core/inspector/InspectorDOMSnapshotAgent.h

Index: third_party/WebKit/Source/core/inspector/InspectorDOMSnapshotAgent.h
diff --git a/third_party/WebKit/Source/core/inspector/InspectorDOMSnapshotAgent.h b/third_party/WebKit/Source/core/inspector/InspectorDOMSnapshotAgent.h
new file mode 100644
index 0000000000000000000000000000000000000000..1b0103568eac2fcad8920b381c9c67c7842ff9e4
--- /dev/null
+++ b/third_party/WebKit/Source/core/inspector/InspectorDOMSnapshotAgent.h
@@ -0,0 +1,47 @@
+// Copyright 2017 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 InspectorDOMSnapshotAgent_h
+#define InspectorDOMSnapshotAgent_h
+
+#include "core/inspector/InspectorBaseAgent.h"
+#include "core/inspector/InspectorCSSAgent.h"
+#include "core/inspector/InspectorDOMAgent.h"
+#include "core/inspector/protocol/DOMSnapshot.h"
+
+namespace blink {
+
+class CORE_EXPORT InspectorDOMSnapshotAgent final
+    : public InspectorBaseAgent<protocol::DOMSnapshot::Metainfo> {
+  WTF_MAKE_NONCOPYABLE(InspectorDOMSnapshotAgent);
+
+ public:
+  static InspectorDOMSnapshotAgent* Create(InspectorCSSAgent* css_agent,
+                                           InspectorDOMAgent* dom_agent) {
+    return new InspectorDOMSnapshotAgent(css_agent, dom_agent);
+  }
+
+  ~InspectorDOMSnapshotAgent() override;
+  DECLARE_VIRTUAL_TRACE();
+
+  protocol::Response getSnapshot(
+      std::unique_ptr<protocol::Array<String>> style_whitelist,
+      protocol::Maybe<int> dom_depth,
+      protocol::Maybe<bool> pierce,
+      std::unique_ptr<protocol::Array<protocol::DOM::Node>>* dom_nodes,
+      std::unique_ptr<protocol::Array<protocol::CSS::LayoutTreeNode>>*
+          layout_tree_nodes,
+      std::unique_ptr<protocol::Array<protocol::CSS::ComputedStyle>>*
+          computed_styles) override;
+
+ private:
+  InspectorDOMSnapshotAgent(InspectorCSSAgent*, InspectorDOMAgent*);
+
+  Member<InspectorCSSAgent> css_agent_;
+  Member<InspectorDOMAgent> dom_agent_;
+};
+
+}  // namespace blink
+
+#endif  // !defined(InspectorDOMSnapshotAgent_h)