Refactor Blink's ServiceConnector and add ability to mock in layout tests

content/renderer/mojo/blink_connector_impl.h

Index: content/renderer/mojo/blink_connector_impl.h
diff --git a/content/renderer/mojo/blink_connector_impl.h b/content/renderer/mojo/blink_connector_impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..7b35ee5388b8e16f3dabc29d7645ab6b84d3e0f6
--- /dev/null
+++ b/content/renderer/mojo/blink_connector_impl.h
@@ -0,0 +1,73 @@
+// 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 CONTENT_RENDERER_MOJO_BLINK_CONNECTOR_IMPL_H_
+#define CONTENT_RENDERER_MOJO_BLINK_CONNECTOR_IMPL_H_
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "content/common/content_export.h"
+#include "mojo/public/cpp/system/message_pipe.h"
+#include "services/service_manager/public/cpp/connector.h"
+#include "third_party/WebKit/public/platform/Connector.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+}
+
+namespace content {
+
+// An implementation of blink::Connector that forwards to a
+// service_manager::Connector.
+class CONTENT_EXPORT BlinkConnectorImpl : public blink::Connector {
+ public:
+  explicit BlinkConnectorImpl(
+      std::unique_ptr<service_manager::Connector> connector);
+  ~BlinkConnectorImpl();
+
+  // blink::Connector override.
+  void bindInterface(const char* service_name,
+                     const char* interface_name,
+                     mojo::ScopedMessagePipeHandle handle) override;
+
+  void AddOverrideForTesting(
+      const std::string& service_name,
+      const std::string& interface_name,
+      const base::Callback<void(mojo::ScopedMessagePipeHandle)>& binder);
+
+  void ClearOverridesForTesting();
+
+  void SetConnector(std::unique_ptr<service_manager::Connector> connector) {
+    connector_ = std::move(connector);
+  }
+
+  base::WeakPtr<BlinkConnectorImpl> GetWeakPtr();
+
+ private:
+  using Binder = base::Callback<void(mojo::ScopedMessagePipeHandle)>;
+  using InterfaceBinderMap = std::map<std::string, Binder>;
+  using ServiceBinderMap =
+      std::map<std::string, std::unique_ptr<InterfaceBinderMap>>;
+
+  // Returns a pointer to the InterfaceBinderMap in action for |service_name|,
+  // or nullptr if |service_name| has no overrides in action.
+  InterfaceBinderMap* GetOverridesForService(const char* service_name);
+
+  // Maps service names to the per-interface overrides that have been set for
+  // that service.
+  ServiceBinderMap service_binders_;
+
+  std::unique_ptr<service_manager::Connector> connector_;
+
+  scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
+
+  base::WeakPtrFactory<BlinkConnectorImpl> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(BlinkConnectorImpl);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_MOJO_BLINK_CONNECTOR_IMPL_H_