arc-bridge: Restart ARC instance on crash

components/arc/test/fake_arc_bridge_instance.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_ARC_TEST_FAKE_ARC_BRIDGE_INSTANCE_H_
 #define COMPONENTS_ARC_TEST_FAKE_ARC_BRIDGE_INSTANCE_H_
 
 #include "base/macros.h"
 #include "components/arc/arc_bridge_service.h"
 #include "components/arc/common/arc_bridge.mojom.h"
 #include "mojo/public/cpp/bindings/binding.h"
 
 namespace arc {
 
 class FakeArcBridgeInstance : public ArcBridgeInstance {
  public:
   FakeArcBridgeInstance();
   ~FakeArcBridgeInstance() override;
 
   // Finalizes the connection between the host and the instance, and signals
   // the host that the boot sequence has finished.
   void Bind(mojo::InterfaceRequest<ArcBridgeInstance> interface_request);
 
+  // Resets the binding. Useful to simulate a restart.
+  void Unbind();
+
   // ArcBridgeInstance:
   void Init(ArcBridgeHostPtr host) override;
 
+  // Ensures the call to Init() has been dispatched.
+  void WaitForInitCall();
+
+  // The number of times Init() has been called.
+  int init_calls() const { return init_calls_; }
+
  private:
   // Mojo endpoints.
   mojo::Binding<ArcBridgeInstance> binding_;
   ArcBridgeHostPtr host_ptr_;
+  int init_calls_ = 0;
 
   DISALLOW_COPY_AND_ASSIGN(FakeArcBridgeInstance);
 };
 
 }  // namespace arc
 
 #endif  // COMPONENTS_ARC_TEST_FAKE_ARC_BRIDGE_INSTANCE_H_