[Autofill] Migrate ChromePasswordManagerClient<-->PasswordGenerationAgent IPCs to mojo.

content/common/associated_interface_provider_impl.h

 // 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/public/common/associated_interface_provider.h"
 
 #include <stdint.h>
+#include <memory>
 
 #include "base/macros.h"
 #include "content/common/associated_interfaces.mojom.h"
-#include "mojo/public/cpp/bindings/associated_group.h"
 
 namespace content {
 
 class AssociatedInterfaceProviderImpl : public AssociatedInterfaceProvider {
  public:
   // Binds this to a remote mojom::AssociatedInterfaceProvider.
   explicit AssociatedInterfaceProviderImpl(
       mojom::AssociatedInterfaceProviderAssociatedPtr proxy);
+  // Constructs a local provider with no remote interfaces. This is useful in
+  // conjunction with OverrideBinderForTesting(), in test environments where
+  // there may not be a remote |mojom::AssociatedInterfaceProvider| available.
+  AssociatedInterfaceProviderImpl();
   ~AssociatedInterfaceProviderImpl() override;
 
   // AssociatedInterfaceProvider:
   void GetInterface(const std::string& name,
                     mojo::ScopedInterfaceEndpointHandle handle) override;
   mojo::AssociatedGroup* GetAssociatedGroup() override;
+  void OverrideBinderForTesting(
+      const std::string& name,
+      const base::Callback<void(mojo::ScopedInterfaceEndpointHandle)>& binder)
+      override;
 
  private:
+  class LocalProvider;
+
   mojom::AssociatedInterfaceProviderAssociatedPtr proxy_;
 
+  std::unique_ptr<LocalProvider> local_provider_;
+
   DISALLOW_COPY_AND_ASSIGN(AssociatedInterfaceProviderImpl);
 };
 
 }  // namespace content