Introduce a temporary Views vendor to integrate core modules into core.

lib/Drupal/search/ViewsSearchQuery.php

+<?php
+
+namespace Drupal\search;
+
+/**
+ * Extends the core SearchQuery.
+ *
+ * @todo: Make this class PSR-0 compatible.
+ */
+class ViewsSearchQuery extends SearchQuery {
+  public function &conditions() {
+    return $this->conditions;
+  }
+  public function words() {
+    return $this->words;
+  }
+
+  public function simple() {
+    return $this->simple;
+  }
+
+  public function matches() {
+    return $this->matches;
+  }
+
+  public function publicParseSearchExpression() {
+    return $this->parseSearchExpression();
+  }
+
+  function condition_replace_string($search, $replace, &$condition) {
+    if ($condition['field'] instanceof DatabaseCondition) {
+      $conditions =& $condition['field']->conditions();
+      foreach ($conditions as $key => &$subcondition) {
+        if (is_numeric($key)) {
+          $this->condition_replace_string($search, $replace, $subcondition);
+        }
+      }
+    }
+    else {
+      $condition['field'] = str_replace($search, $replace, $condition['field']);
+    }
+  }
+}

lib/Drupal/aggregator/Plugin/views/argument/CategoryCid.php → lib/Views/aggregator/Plugin/views/argument/CategoryCid.php

@@ -5,7 +5,7 @@
  * Definition of views_handler_argument_aggregator_category_cid.
  */
 
-namespace Drupal\aggregator\Plugin\views\argument;
+namespace Views\aggregator\Plugin\views\argument;
 
 use Drupal\views\Plugin\views\argument\Numeric;
 use Drupal\Core\Annotation\Plugin;

lib/Drupal/aggregator/Plugin/views/argument/Fid.php → lib/Views/aggregator/Plugin/views/argument/Fid.php

@@ -5,7 +5,7 @@
  * Definition of views_handler_argument_aggregator_fid.
  */
 
-namespace Drupal\aggregator\Plugin\views\argument;
+namespace Views\aggregator\Plugin\views\argument;
 
 use Drupal\views\Plugin\views\argument\Numeric;
 use Drupal\Core\Annotation\Plugin;

lib/Drupal/aggregator/Plugin/views/argument/Iid.php → lib/Views/aggregator/Plugin/views/argument/Iid.php

@@ -5,7 +5,7 @@
  * Definition of views_handler_argument_aggregator_iid.
  */
 
-namespace Drupal\aggregator\Plugin\views\argument;
+namespace Views\aggregator\Plugin\views\argument;
 
 use Drupal\views\Plugin\views\argument\Numeric;
 use Drupal\Core\Annotation\Plugin;

lib/Drupal/aggregator/Plugin/views/field/Category.php → lib/Views/aggregator/Plugin/views/field/Category.php

@@ -5,7 +5,7 @@
  * Definition of views_handler_field_aggregator_category.
  */
 
-namespace Drupal\aggregator\Plugin\views\field;
+namespace Views\aggregator\Plugin\views\field;
 
 use Drupal\views\Plugin\views\field\FieldPluginBase;
 use Drupal\Core\Annotation\Plugin;

lib/Drupal/aggregator/Plugin/views/field/TitleLink.php → lib/Views/aggregator/Plugin/views/field/TitleLink.php

@@ -5,7 +5,7 @@
  * Definition of views_handler_field_aggregator_title_link.
  */
 
-namespace Drupal\aggregator\Plugin\views\field;
+namespace Views\aggregator\Plugin\views\field;
 
 use Drupal\views\Plugin\views\field\FieldPluginBase;
 use Drupal\Core\Annotation\Plugin;

lib/Drupal/aggregator/Plugin/views/field/Xss.php → lib/Views/aggregator/Plugin/views/field/Xss.php

@@ -5,7 +5,7 @@
  * Definition of views_handler_field_aggregator_xss.
  */
 
-namespace Drupal\aggregator\Plugin\views\field;
+namespace Views\aggregator\Plugin\views\field;
 
 use Drupal\views\Plugin\views\field\FieldPluginBase;
 use Drupal\Core\Annotation\Plugin;

lib/Drupal/aggregator/Plugin/views/filter/CategoryCid.php → lib/Views/aggregator/Plugin/views/filter/CategoryCid.php

@@ -5,7 +5,7 @@
  * Definition of views_handler_filter_aggregator_category_cid.
  */
 
-namespace Drupal\aggregator\Plugin\views\filter;
+namespace Views\aggregator\Plugin\views\filter;
 
 use Drupal\views\Plugin\views\filter\InOperator;
 use Drupal\Core\Annotation\Plugin;

lib/Drupal/aggregator/Plugin/views/row/Rss.php → lib/Views/aggregator/Plugin/views/row/Rss.php

@@ -5,7 +5,7 @@
  * Contains the Aggregator Item RSS row style plugin.
  */
 
-namespace Drupal\aggregator\Plugin\views\row;
+namespace Views\aggregator\Plugin\views\row;
 
 use Drupal\views\Plugin\views\row\RowPluginBase;
 use Drupal\Core\Annotation\Plugin;

lib/Drupal/book/Plugin/views/argument_default/Root.php → lib/Views/book/Plugin/views/argument_default/Root.php

@@ -4,7 +4,7 @@
  * Contains the book root from current node argument default plugin.
  */
 
-namespace Drupal\book\Plugin\views\argument_default;
+namespace Views\book\Plugin\views\argument_default;
 
 use Views\node\Plugin\views\argument_default\Node;
 use Drupal\Core\Annotation\Plugin;

lib/Drupal/comment/Plugin/views/argument/UserUid.php → lib/Views/comment/Plugin/views/argument/UserUid.php

@@ -5,7 +5,7 @@
  * Definition of views_handler_argument_comment_user_uid.
  */
 
-namespace Drupal\comment\Plugin\views\argument;
+namespace Views\comment\Plugin\views\argument;
 
 use Drupal\views\Plugin\views\argument\ArgumentPluginBase;
 use Drupal\Core\Annotation\Plugin;

lib/Drupal/comment/Plugin/views/field/Comment.php → lib/Views/comment/Plugin/views/field/Comment.php

@@ -5,7 +5,7 @@
  * Definition of views_handler_field_comment.
  */
 
-namespace Drupal\comment\Plugin\views\field;
+namespace Views\comment\Plugin\views\field;
 
 use Drupal\views\Plugin\views\field\FieldPluginBase;
 use Drupal\Core\Annotation\Plugin;

lib/Drupal/comment/Plugin/views/field/Depth.php → lib/Views/comment/Plugin/views/field/Depth.php

@@ -5,7 +5,7 @@
  * Definition of views_handler_field_comment_depth.
  */
 
-namespace Drupal\comment\Plugin\views\field;
+namespace Views\comment\Plugin\views\field;
 
 use Drupal\Core\Annotation\Plugin;
 use Drupal\views\Plugin\views\field\FieldPluginBase;
@@ -21,7 +21,7 @@
  *   plugin_id = "comment_depth"
  * )
  */
-class views_handler_field_comment_depth extends FieldPluginBase {
+class Depth extends FieldPluginBase {
   /**
    * Work out the depth of this comment
    */

lib/Drupal/comment/Plugin/views/field/LInkDelete.php → lib/Views/comment/Plugin/views/field/LInkDelete.php

@@ -5,7 +5,7 @@
  * Definition of views_handler_field_comment_link_delete.
  */
 
-namespace Drupal\comment\Plugin\views\field;
+namespace Views\comment\Plugin\views\field;
 
 use Drupal\Core\Annotation\Plugin;
 

lib/Drupal/comment/Plugin/views/field/LastTimestamp.php → lib/Views/comment/Plugin/views/field/LastTimestamp.php

@@ -5,7 +5,7 @@
  * Definition of views_handler_field_last_comment_timestamp.
  */
 
-namespace Drupal\comment\Plugin\views\field;
+namespace Views\comment\Plugin\views\field;
 
 use Drupal\views\Plugin\views\field\Date;
 use Drupal\Core\Annotation\Plugin;

lib/Drupal/comment/Plugin/views/field/Link.php → lib/Views/comment/Plugin/views/field/Link.php

@@ -5,9 +5,10 @@
  * Definition of views_handler_field_comment_link.
  */
 
-namespace Drupal\comment\Plugin\views\field;
+namespace Views\comment\Plugin\views\field;
 
 use Drupal\views\Plugin\views\field\Entity;
+use Drupal\Core\Annotation\Plugin;
 
 /**
  * Base field handler to present a link.

lib/Drupal/comment/Plugin/views/field/LinkApprove.php → lib/Views/comment/Plugin/views/field/LinkApprove.php

@@ -5,7 +5,7 @@
  * Definition of views_handler_field_comment_link_approve.
  */
 
-namespace Drupal\comment\Plugin\views\field;
+namespace Views\comment\Plugin\views\field;
 
 use Drupal\Core\Annotation\Plugin;
 
@@ -20,7 +20,7 @@
  *   plugin_id = "comment_link_approve"
  * )
  */
-class views_handler_field_comment_link_approve extends Link {
+class LinkApprove extends Link {
   function access() {
     //needs permission to administer comments in general
     return user_access('administer comments');

lib/Drupal/comment/Plugin/views/field/LinkEdit.php → lib/Views/comment/Plugin/views/field/LinkEdit.php

@@ -5,7 +5,7 @@
  * Definition of views_handler_field_comment_link_edit.
  */
 
-namespace Drupal\comment\Plugin\views\field;
+namespace Views\comment\Plugin\views\field;
 
 use Drupal\Core\Annotation\Plugin;
 

lib/Drupal/comment/Plugin/views/field/LinkReply.php → lib/Views/comment/Plugin/views/field/LinkReply.php

@@ -5,7 +5,7 @@
  * Definition of views_handler_field_comment_link_reply.
  */
 
-namespace Drupal\comment\Plugin\views\field;
+namespace Views\comment\Plugin\views\field;
 
 use Drupal\Core\Annotation\Plugin;
 

lib/Drupal/comment/Plugin/views/field/NcsLastCommentName.php → lib/Views/comment/Plugin/views/field/NcsLastCommentName.php

@@ -5,7 +5,7 @@
  * Definition of views_handler_field_ncs_last_comment_name.
  */
 
-namespace Drupal\comment\Plugin\views\field;
+namespace Views\comment\Plugin\views\field;
 
 use Drupal\views\Join;
 use Drupal\views\Plugin\views\field\FieldPluginBase;