Add BlimpClientContext and factory with real and dummy implementation

chrome/browser/android/blimp/blimp_client_context_factory.cc

+// 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 "chrome/browser/android/blimp/blimp_client_context_factory.h"
+
+#include "base/memory/singleton.h"
+#include "base/supports_user_data.h"
+#include "blimp/client/public/blimp_client_context.h"
+#include "components/keyed_service/content/browser_context_dependency_manager.h"
+#include "content/public/browser/browser_context.h"
+
+// static
+BlimpClientContextFactory* BlimpClientContextFactory::GetInstance() {
+  return base::Singleton<BlimpClientContextFactory>::get();
+}
+
+// static
+blimp::client::BlimpClientContext*
+BlimpClientContextFactory::GetForBrowserContext(
+    content::BrowserContext* context) {
+  return static_cast<blimp::client::BlimpClientContext*>(
+      GetInstance()->GetServiceForBrowserContext(context, true));
+}
+
+BlimpClientContextFactory::BlimpClientContextFactory()
+    : BrowserContextKeyedServiceFactory(
+          "blimp::client::BlimpClientContext",
+          BrowserContextDependencyManager::GetInstance()) {}
+
+BlimpClientContextFactory::~BlimpClientContextFactory() {}
+
+KeyedService* BlimpClientContextFactory::BuildServiceInstanceFor(
+    content::BrowserContext* context) const {
+  return blimp::client::BlimpClientContext::Create();
+}
+
+content::BrowserContext* BlimpClientContextFactory::GetBrowserContextToUse(
+    content::BrowserContext* context) const {
+  return context;
+}