Styling and imgs to support new read_marker semantics

Support for adding a new 'Scroll up' bar in react-sdk

src/skins/vector/css/matrix-react-sdk/structures/RoomView.css

@@ -95,12 +95,20 @@ limitations under the License.
     flex: 0 0 auto;
 }
 
-.mx_RoomView_messagePanel {
+.mx_RoomView_topUnreadMessagesBar {
     -webkit-box-ordinal-group: 3;
     -moz-box-ordinal-group: 3;
     -ms-flex-order: 3;
     -webkit-order: 3;
     order: 3;
+}
+
+.mx_RoomView_messagePanel {
+    -webkit-box-ordinal-group: 4;
+    -moz-box-ordinal-group: 4;
+    -ms-flex-order: 4;
+    -webkit-order: 4;
+    order: 4;
 
     -webkit-flex: 1 1 0;
     flex: 1 1 0;
@@ -180,11 +188,11 @@ hr.mx_RoomView_myReadMarker {
 }
 
 .mx_RoomView_statusArea {
-    -webkit-box-ordinal-group: 4;
-    -moz-box-ordinal-group: 4;
-    -ms-flex-order: 4;
-    -webkit-order: 4;
-    order: 4;
+    -webkit-box-ordinal-group: 5;
+    -moz-box-ordinal-group: 5;
+    -ms-flex-order: 5;
+    -webkit-order: 5;
+    order: 5;
 
     width: 100%;
     -webkit-flex: 0 0 auto;
@@ -343,11 +351,11 @@ hr.mx_RoomView_myReadMarker {
 }
 
 .mx_RoomView .mx_MessageComposer {
-    -webkit-box-ordinal-group: 5;
-    -moz-box-ordinal-group: 5;
-    -ms-flex-order: 5;
-    -webkit-order: 5;
-    order: 5;
+    -webkit-box-ordinal-group: 6;
+    -moz-box-ordinal-group: 6;
+    -ms-flex-order: 6;
+    -webkit-order: 6;
+    order: 6;
 
     width: 100%;
     -webkit-flex: 0 0 auto;

src/skins/vector/css/matrix-react-sdk/views/rooms/TopUnreadMessagesBar.css

@@ -0,0 +1,44 @@
+/*
+Copyright 2016 OpenMarket Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+.mx_TopUnreadMessagesBar { 
+    max-width: 960px;
+    padding-top: 5px;
+    padding-bottom: 5px;
+    border-bottom: 1px solid #eee;
+}
+
+.mx_TopUnreadMessagesBar_scrollUp { 
+    display: inline;
+    cursor: pointer;
+}
+
+.mx_TopUnreadMessagesBar_scrollUp img { 
+    padding-left: 10px;
+    padding-right: 31px;
+    vertical-align: middle;
+}
+
+.mx_TopUnreadMessagesBar_scrollUp span { 
+    opacity: 0.5;
+}
+
+.mx_TopUnreadMessagesBar_close { 
+    float: right;
+    padding-right: 14px;
+    padding-top: 3px;
+    cursor: pointer;
+}