Support 'foreach' in a project dashboard config

Change-Id: I8ede9ec3d4c0efa16a88bad55cc59b2b039f0cdc

Documentation/user-dashboards.txt

@@ -97,6 +97,20 @@ dashboard.description::
 +
 The description of the dashboard.
 
+dashboard.foreach::
++
+The value of the foreach parameter gets appended to every query in the
+dashboard.
++
+Example dashboard config section to constrain the entire dashboard to
+the project to which it is applied:
++
+----
+[dashboard]
+  foreach = project:${project}
+----
+
+
 Section section
 ~~~~~~~~~~~~~~~
 

gerrit-gwtui/src/main/java/com/google/gerrit/client/dashboards/DashboardInfo.java

@@ -22,6 +22,7 @@ public class DashboardInfo extends JavaScriptObject {
   public final native String ref() /*-{ return this.ref; }-*/;
   public final native String path() /*-{ return this.path; }-*/;
   public final native String description() /*-{ return this.description; }-*/;
+  public final native String foreach() /*-{ return this.foreach; }-*/;
   public final native String url() /*-{ return this.url; }-*/;
   public final native boolean isDefault() /*-{ return this['default'] ? true : false; }-*/;
 

gerrit-server/src/main/java/com/google/gerrit/server/project/DashboardsCollection.java

@@ -144,9 +144,13 @@ class DashboardsCollection implements
     info.title = config.getString("dashboard", null, "title");
     info.description = config.getString("dashboard", null, "description");
     info.isDefault = setDefault ? (info.id.equals(defaultOf(project)) ? true : null) : null;
+    info.foreach = config.getString("dashboard", null, "foreach");
 
     UrlEncoded u = new UrlEncoded("/dashboard/");
     u.put("title", Objects.firstNonNull(info.title, info.path));
+    if (info.foreach != null) {
+      u.put("foreach", replace(project.getName(), info.foreach));
+    }
     for (String name : config.getSubsections("section")) {
       Section s = new Section();
       s.name = name;
@@ -181,6 +185,7 @@ class DashboardsCollection implements
     String ref;
     String path;
     String description;
+    String foreach;
     String url;
 
     @SerializedName("default")