Add BlimpClientContext and factory with real and dummy implementation

blimp/client/public/blimp_client_context.h

Index: blimp/client/public/blimp_client_context.h
diff --git a/blimp/client/public/blimp_client_context.h b/blimp/client/public/blimp_client_context.h
new file mode 100644
index 0000000000000000000000000000000000000000..00ca47b14eef5cd8e509a1090f64c3e888016866
--- /dev/null
+++ b/blimp/client/public/blimp_client_context.h
@@ -0,0 +1,56 @@
+// 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.
+
+#ifndef BLIMP_CLIENT_PUBLIC_BLIMP_CLIENT_CONTEXT_H_
+#define BLIMP_CLIENT_PUBLIC_BLIMP_CLIENT_CONTEXT_H_
+
+#include <memory>
+
+#include "blimp/client/public/blimp_client_context_delegate.h"
+#include "blimp/client/public/blimp_contents.h"
+#include "components/keyed_service/core/keyed_service.h"
+
+#if defined(OS_ANDROID)
+#include "base/android/jni_android.h"
+#endif  // defined(OS_ANDROID)
+
+namespace base {
+class SupportsUserData;
+}
+
+namespace blimp {
+namespace client {
+
+// BlimpClientContext is the core class for the Blimp client. It provides hooks
+// for creating BlimpContents and other features that are per
+// BrowserContext/Profile.
+class BlimpClientContext : public KeyedService {
+ public:
+#if defined(OS_ANDROID)
+  // Returns a Java object of the type BlimpClientContext.
+  virtual base::android::ScopedJavaLocalRef<jobject> GetJavaObject() = 0;
+#endif  // defined(OS_ANDROID)
+
+  // Creates a BlimpClientContext. The implementation of this function
+  // depends on whether the core or dummy implementation of Blimp has been
+  // linked in.
+  static BlimpClientContext* Create();
+
+  // The delegate provides all the required functionality from the embedder.
+  virtual void SetDelegate(BlimpClientContextDelegate* delegate) = 0;
+
+  // Creates a new BlimpContents.
+  virtual std::unique_ptr<BlimpContents> CreateBlimpContents() = 0;
+
+ protected:
+  BlimpClientContext() = default;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(BlimpClientContext);
+};
+
+}  // namespace client
+}  // namespace blimp
+
+#endif  // BLIMP_CLIENT_PUBLIC_BLIMP_CLIENT_CONTEXT_H_