Integrate UI with authentication flow.

blimp/client/core/settings/android/blimp_settings_android.h

Index: blimp/client/core/settings/android/blimp_settings_android.h
diff --git a/blimp/client/core/settings/android/blimp_settings_android.h b/blimp/client/core/settings/android/blimp_settings_android.h
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index 0000000000000000000000000000000000000000..d8425b6f6640109c4af70d2d001e494cf4ad2152
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+// 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_CORE_SETTINGS_ANDROID_BLIMP_SETTINGS_ANDROID_H_
+#define BLIMP_CLIENT_CORE_SETTINGS_ANDROID_BLIMP_SETTINGS_ANDROID_H_
+
+#include "base/android/jni_android.h"
+#include "base/android/scoped_java_ref.h"
+#include "base/macros.h"
+#include "blimp/client/core/session/identity_source.h"
+
+namespace blimp {
+namespace client {
+
+class BlimpClientContextImplAndroid;
+
+// JNI bridge between AboutBlimpPreferences.java and native code.
+class BlimpSettingsAndroid : public IdentityProvider::Observer {
+ public:
+  static bool RegisterJni(JNIEnv* env);
+  static BlimpSettingsAndroid* FromJavaObject(JNIEnv* env, jobject jobj);
+  BlimpSettingsAndroid(JNIEnv* env, jobject jobj);
+  ~BlimpSettingsAndroid() override;
+
+  void Destroy(JNIEnv* env, const base::android::JavaParamRef<jobject>& jobj);
+
+  void SetIdentitySource(IdentitySource* identity_source);
+
+  // Notify Java layer for user sign in state change.
+  void OnSignedOut();
+  void OnSignedIn();
+
+  // IdentityProvider::Observer implementation.
+  void OnActiveAccountLogout() override;
+  void OnActiveAccountLogin() override;
+
+ private:
+  base::android::ScopedJavaGlobalRef<jobject> java_obj_;
+
+  // IdentitySource that broadcasts sign in state change.
+  IdentitySource* identity_source_;
+
+  DISALLOW_COPY_AND_ASSIGN(BlimpSettingsAndroid);
+};
+
+}  // namespace client
+}  // namespace blimp
+
+#endif  //  BLIMP_CLIENT_CORE_SETTINGS_ANDROID_BLIMP_SETTINGS_ANDROID_H_