SideBySide2: Show project name before file path

On large complex projects like Android its useful to know which
project a file is in when reviewing the file.  Its common for
reviewers to span projects and many projects may have a common file
like Makefile or BUCK.

Bug: issue 148
Change-Id: I3c8e4fbc57be7de723199cf647508238f4a9feb7

gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/Header.java

@@ -16,6 +16,7 @@ package com.google.gerrit.client.diff;
 
 import com.google.gerrit.client.Gerrit;
 import com.google.gerrit.client.changes.ChangeApi;
+import com.google.gerrit.client.changes.ChangeInfo;
 import com.google.gerrit.client.changes.ReviewInfo;
 import com.google.gerrit.client.changes.Util;
 import com.google.gerrit.client.patches.PatchUtil;
@@ -53,6 +54,7 @@ class Header extends Composite {
   private static final Binder uiBinder = GWT.create(Binder.class);
 
   @UiField CheckBox reviewed;
+  @UiField Element project;
   @UiField Element filePath;
 
   @UiField Element noDiff;
@@ -144,6 +146,10 @@ class Header extends Composite {
     }
   }
 
+  void set(ChangeInfo info) {
+    project.setInnerText(info.project());
+  }
+
   void setReviewed(boolean r) {
     reviewed.setValue(r, true);
   }

gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/Header.ui.xml

@@ -29,6 +29,7 @@ limitations under the License.
     vertical-align: bottom;
   }
   .path {
+    white-space: no-wrap;
   }
   .navigation {
     position: absolute;
@@ -48,7 +49,7 @@ limitations under the License.
         title='Mark file as reviewed (Shortcut: r)'>
       <ui:attribute name='title'/>
     </g:CheckBox>
-    <span ui:field='filePath' class='{style.path}'/>
+    <span class='{style.path}'><span ui:field='project'/> / <span ui:field='filePath'/></span>
 
     <span ui:field='noDiff' class='{style.nodiff}'>
       <ui:msg>No Differences</ui:msg>

gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/SideBySide2.java

@@ -212,6 +212,7 @@ public class SideBySide2 extends Screen {
         JsArray<RevisionInfo> list = info.revisions().values();
         RevisionInfo.sortRevisionInfoByNumber(list);
         diffTable.setUpPatchSetNav(list, diff);
+        header.set(info);
       }}));
 
     ConfigInfoCache.get(changeId, group.addFinal(