Add a basic web UI for intracluster sync logs

Summary: Depends on D19798. Ref T13216. This puts at least a basic UI on top of sync logs.

Test Plan:
Viewed logs from the web UI and exported data. Note that these syncs are somewhat simulated since I my local cluster is somewhat-faked (i.e., not actually multiple machines).

{F5995899}

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13216

Differential Revision: https://secure.phabricator.com/D19799

src/applications/diffusion/controller/DiffusionRepositoryController.php

@@ -370,8 +370,17 @@ final class DiffusionRepositoryController extends DiffusionController {
       $action_view->addAction(
         id(new PhabricatorActionView())
           ->setName(pht('View Push Logs'))
-          ->setIcon('fa-list-alt')
+          ->setIcon('fa-upload')
           ->setHref($push_uri));
+
+      $pull_uri = $this->getApplicationURI(
+        'synclog/?repositories='.$repository->getPHID());
+
+      $action_view->addAction(
+        id(new PhabricatorActionView())
+          ->setName(pht('View Sync Logs'))
+          ->setIcon('fa-exchange')
+          ->setHref($pull_uri));
     }
 
     $pull_uri = $this->getApplicationURI(
@@ -380,7 +389,7 @@ final class DiffusionRepositoryController extends DiffusionController {
     $action_view->addAction(
       id(new PhabricatorActionView())
         ->setName(pht('View Pull Logs'))
-        ->setIcon('fa-list-alt')
+        ->setIcon('fa-download')
         ->setHref($pull_uri));
 
     return $action_view;

src/applications/diffusion/controller/DiffusionSyncLogListController.php

@@ -0,0 +1,17 @@
+<?php
+
+final class DiffusionSyncLogListController
+  extends DiffusionLogController {
+
+  public function handleRequest(AphrontRequest $request) {
+    return id(new DiffusionSyncLogSearchEngine())
+      ->setController($this)
+      ->buildResponse();
+  }
+
+  protected function buildApplicationCrumbs() {
+    return parent::buildApplicationCrumbs()
+      ->addTextCrumb(pht('Sync Logs'), $this->getApplicationURI('synclog/'));
+  }
+
+}