Make inline comment preview work in Diffusion

Summary: created a PhabricatorInlineCommentPreviewController so controllers in Diffusion and Differential respectively just have to handle the URI mapping and data loading like good little controllers.

Test Plan:
left inline comments on commits, deleted inline commits, submitted inline comments -- all worked well
did the same on some diffs

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T1176

Differential Revision: https://secure.phabricator.com/D3034

src/applications/diffusion/controller/DiffusionInlineCommentPreviewController.php

@@ -0,0 +1,38 @@
+<?php
+
+/*
+ * Copyright 2012 Facebook, Inc.
+ *
+ * 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.
+ */
+
+final class DiffusionInlineCommentPreviewController
+  extends PhabricatorInlineCommentPreviewController {
+
+  private $commitPHID;
+
+  public function willProcessRequest(array $data) {
+    $this->commitPHID = $data['phid'];
+  }
+
+  protected function loadInlineComments() {
+    $user = $this->getRequest()->getUser();
+
+    $inlines = id(new PhabricatorAuditInlineComment())->loadAllWhere(
+      'authorPHID = %s AND commitPHID = %s AND auditCommentID IS NULL',
+      $user->getPHID(),
+      $this->commitPHID);
+
+    return $inlines;
+  }
+}