mustash: Implement basic input event routing in renderer

content/renderer/compositor_mus_connection.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 CONTENT_RENDERER_COMPOSITOR_MUS_CONNECTION_H_
+#define CONTENT_RENDERER_COMPOSITOR_MUS_CONNECTION_H_
+
+#include "base/bind.h"
+#include "base/macros.h"
+#include "components/mus/public/cpp/window.h"
+#include "components/mus/public/cpp/window_observer.h"
+#include "components/mus/public/cpp/window_tree_connection.h"
+#include "components/mus/public/cpp/window_tree_delegate.h"
+#include "third_party/WebKit/public/web/WebInputEvent.h"
+
+namespace content {
+
+class InputHandlerManager;
+
+// CompositorMusConnection manages the connection to the Mandoline UI Service
+// (Mus) on the compositor thread. For operations that need to happen on the
+// main thread, CompositorMusConnection deals with passing information across
+// threads. CompositorMusConnection is constructed on the main thread. By
+// default all other methods are assumed to run on the compositor thread unless
+// explicited suffixed with OnMainThread.
+class CompositorMusConnection
+    : public mus::WindowTreeDelegate,
+      public mus::WindowObserver,
+      public base::RefCountedThreadSafe<CompositorMusConnection> {
+ public:
+  // Created on main thread.
+  CompositorMusConnection(
+      int routing_id,
+      const scoped_refptr<base::SingleThreadTaskRunner>& main_task_runner,
+      const scoped_refptr<base::SingleThreadTaskRunner>& compositor_task_runner,
+      mojo::InterfaceRequest<mus::mojom::WindowTreeClient> request,
+      InputHandlerManager* input_handler_manager);
+
+  // Attaches the provided |surface_binding| with the mus::Window for the
+  // renderer once it becomes available.
+  void AttachSurfaceOnMainThread(
+      scoped_ptr<mus::WindowSurfaceBinding> surface_binding);
+
+ private:
+  friend class base::RefCountedThreadSafe<CompositorMusConnection>;
+
+  ~CompositorMusConnection() override;
+
+  void AttachSurfaceOnCompositorThread(
+      scoped_ptr<mus::WindowSurfaceBinding> surface_binding);
+
+  void CreateWindowTreeConnectionOnCompositorThread(
+      mojo::InterfaceRequest<mus::mojom::WindowTreeClient> request);
+
+  void OnConnectionLostOnMainThread();
+
+  void OnWindowInputEventOnMainThread(
+      scoped_ptr<blink::WebInputEvent> web_event,
+      const base::Closure& ack);
+
+  void OnWindowInputEventAckOnMainThread(const base::Closure& ack);
+
+  // WindowTreeDelegate implementation:
+  void OnConnectionLost(mus::WindowTreeConnection* connection) override;
+  void OnEmbed(mus::Window* root) override;
+
+  // WindowObserver implementation:
+  void OnWindowInputEvent(mus::Window* window,
+                          const mus::mojom::EventPtr& event) override;
+
+  const int routing_id_;
+  mus::Window* root_;
+  scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
+  scoped_refptr<base::SingleThreadTaskRunner> compositor_task_runner_;
+  InputHandlerManager* const input_handler_manager_;
+  scoped_ptr<mus::WindowSurfaceBinding> window_surface_binding_;
+
+  DISALLOW_COPY_AND_ASSIGN(CompositorMusConnection);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_COMPOSITOR_MUS_CONNECTION_H_