html_viewer: Add DevToolsAgentImpl.

components/html_viewer/devtools_agent_impl.h

+// Copyright 2015 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 COMPONENTS_HTML_VIEWER_DEVTOOLS_AGENT_IMPL_H_
+#define COMPONENTS_HTML_VIEWER_DEVTOOLS_AGENT_IMPL_H_
+
+#include "base/macros.h"
+#include "components/devtools_service/public/interfaces/devtools_service.mojom.h"
+#include "third_party/WebKit/public/web/WebDevToolsAgentClient.h"
+#include "third_party/mojo/src/mojo/public/cpp/bindings/binding.h"
+
+namespace blink {
+class WebLocalFrame;
+}
+
+namespace mojo {
+class Shell;
+}
+
+namespace html_viewer {
+
+class DevToolsAgentImpl : public devtools_service::DevToolsAgent,
+                          public blink::WebDevToolsAgentClient,
+                          public mojo::ErrorHandler {
+ public:
+  // |frame| must outlive this object.
+  DevToolsAgentImpl(blink::WebLocalFrame* frame, mojo::Shell* shell);
+  ~DevToolsAgentImpl() override;
+
+  blink::WebLocalFrame* frame() const { return frame_; }
+
+ private:
+  // devtools_service::DevToolsAgent implementation.
+  void SetClient(devtools_service::DevToolsAgentClientPtr client,
+                 const mojo::String& client_id) override;
+  void DispatchProtocolMessage(const mojo::String& message) override;
+
+  // blink::WebDevToolsAgentClient implementation.
+  void sendProtocolMessage(int call_id,
+                           const blink::WebString& response,
+                           const blink::WebString& state);
+
+  // mojo::ErrorHandler implementation.
+  void OnConnectionError() override;
+
+  blink::WebLocalFrame* const frame_;
+  mojo::Binding<DevToolsAgent> binding_;
+  devtools_service::DevToolsAgentClientPtr client_;
+
+  DISALLOW_COPY_AND_ASSIGN(DevToolsAgentImpl);
+};
+
+}  // namespace html_viewer
+
+#endif  // COMPONENTS_HTML_VIEWER_DEVTOOLS_AGENT_IMPL_H_