Add initial social accounts view.

app/src/main/res/layout/fragment_authentication_log_in.xml

@@ -13,10 +13,9 @@
         app:layout_constraintTop_toTopOf="parent" />
 
     <EditText
-        android:id="@+id/text_username"
+        android:id="@+id/text_username_or_email"
         style="@style/AuthenticationEditText"
         android:layout_marginTop="32dp"
-        android:cursorVisible="false"
         android:drawableStart="@drawable/ic_assignment_ind_black_24dp"
         android:hint="@string/msg_username_or_email"
         android:imeOptions="actionNext"
@@ -29,14 +28,51 @@
         android:id="@+id/text_password"
         style="@style/AuthenticationEditText"
         android:layout_marginTop="16dp"
-        android:cursorVisible="false"
         android:drawableStart="@drawable/ic_lock_black_24dp"
         android:hint="@string/msg_password"
         android:imeOptions="actionDone"
         android:inputType="textPassword"
         app:layout_constraintLeft_toLeftOf="parent"
         app:layout_constraintRight_toRightOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/text_username" />
+        app:layout_constraintTop_toBottomOf="@+id/text_username_or_email" />
+
+    <LinearLayout
+        android:id="@+id/social_accounts_container"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginEnd="@dimen/screen_edge_left_and_right_margins"
+        android:layout_marginStart="@dimen/screen_edge_left_and_right_margins"
+        android:layout_marginTop="16dp"
+        android:background="@color/colorPrimaryDark"
+        android:orientation="vertical"
+        android:paddingBottom="32dp"
+        android:paddingTop="@dimen/screen_edge_left_and_right_margins"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/text_password">
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center"
+            android:text="@string/msg_or_continue_using_social_accounts" />
+
+    </LinearLayout>
+
+    <android.support.design.widget.FloatingActionButton
+        android:id="@+id/button_fab"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:src="@drawable/ic_expand_more_black_24dp"
+        android:theme="@style/Theme.AppCompat"
+        android:tint="@color/white"
+        app:backgroundTint="@color/colorAccent"
+        app:elevation="@dimen/fab_elevation"
+        app:fabSize="mini"
+        app:layout_constraintBottom_toBottomOf="@+id/social_accounts_container"
+        app:layout_constraintLeft_toLeftOf="@+id/social_accounts_container"
+        app:layout_constraintRight_toRightOf="@+id/social_accounts_container"
+        app:layout_constraintTop_toBottomOf="@+id/social_accounts_container" />
 
     <TextView
         android:id="@+id/text_new_in_rocket_chat"
@@ -47,7 +83,7 @@
         android:layout_marginStart="@dimen/screen_edge_left_and_right_margins"
         android:gravity="center"
         android:text="@string/msg_new_in_rocket_chat"
-        app:layout_constraintBottom_toTopOf="@+id/button_log_in"
+        app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintLeft_toLeftOf="parent"
         app:layout_constraintRight_toRightOf="parent" />
 
@@ -55,6 +91,7 @@
         android:id="@+id/button_log_in"
         style="@style/AuthenticationButton"
         android:text="@string/title_log_in"
+        android:visibility="gone"
         app:layout_constraintBottom_toBottomOf="parent" />
 
 </android.support.constraint.ConstraintLayout>
\ No newline at end of file