App list: Infrastructure now supports multiple custom launcher pages.

ui/app_list/views/contents_view.cc

Index: ui/app_list/views/contents_view.cc
diff --git a/ui/app_list/views/contents_view.cc b/ui/app_list/views/contents_view.cc
index 9057abc8524f7ac4f61f83e91a398fd17a2fc8d2..650115c386fd04c58da920133a1ad9edc9e35bf6 100644
--- a/ui/app_list/views/contents_view.cc
+++ b/ui/app_list/views/contents_view.cc
@@ -5,6 +5,7 @@
 #include "ui/app_list/views/contents_view.h"
 
 #include <algorithm>
+#include <vector>
 
 #include "base/logging.h"
 #include "grit/ui_resources.h"
@@ -56,10 +57,14 @@ void ContentsView::InitNamedPages(AppListModel* model,
   DCHECK(model);
 
   if (app_list::switches::IsExperimentalAppListEnabled()) {
-    views::View* custom_page_view =
-        view_delegate->CreateCustomPageWebView(GetLocalBounds().size());
-    if (custom_page_view)
-      AddLauncherPage(custom_page_view, IDR_APP_LIST_NOTIFICATIONS_ICON);
+    std::vector<views::View*> custom_page_views =
+        view_delegate->CreateCustomPageWebViews(GetLocalBounds().size());
+    for (std::vector<views::View*>::const_iterator it =
+             custom_page_views.begin();
+         it != custom_page_views.end();
+         ++it) {
+      AddLauncherPage(*it, IDR_APP_LIST_NOTIFICATIONS_ICON);
+    }
 
     start_page_view_ = new StartPageView(app_list_main_view_, view_delegate);
     AddLauncherPage(