Add BlimpClientContext and factory with real and dummy implementation

chrome/browser/android/blimp/blimp_contents_profile_attachment.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.
+
+#ifndef CHROME_BROWSER_ANDROID_BLIMP_BLIMP_CONTENTS_PROFILE_ATTACHMENT_H_
+#define CHROME_BROWSER_ANDROID_BLIMP_BLIMP_CONTENTS_PROFILE_ATTACHMENT_H_
+
+class Profile;
+
+namespace blimp {
+namespace client {
+class BlimpContents;
+}  // namespace client
+}  // namespace blimp
+
+// Attaches a profile to the given BlimpContents as SupportsUserData::Data. This
+// must be called whenever a new BlimpContents has been created.
+void AttachProfileToBlimpContents(blimp::client::BlimpContents* blimp_contents,
+                                  Profile* profile);
+
+// Returns the profile related to a specific BlimpContents. It must have been
+// previously attached using AttachProfileToBlimpContents.
+Profile* GetProfileFromBlimpContents(
+    blimp::client::BlimpContents* blimp_contents);
+
+#endif  // CHROME_BROWSER_ANDROID_BLIMP_BLIMP_CONTENTS_PROFILE_ATTACHMENT_H_