Make meta() accept 'block' option in single argument case.

Allow the block option to be defined in the custom meta tag attributes
array. This allows this usage to be more compact and not require a 2nd
and 3rd argument.

src/View/Helper/HtmlHelper.php

@@ -222,17 +222,16 @@ public function docType($type = 'html5')
      * - `block` - Set to true to append output to view block "meta" or provide
      *   custom block name.
      *
-     * @param string|array $type The title of the external resource
+     * @param string|array $type The title of the external resource, Or an array of attributes for a
+     *   custom meta tag.
      * @param string|array|null $content The address of the external resource or string for content attribute
      * @param array $options Other attributes for the generated tag. If the type attribute is html,
      *    rss, atom, or icon, the mime-type is returned.
-     * @return string A completed `<link />` element.
+     * @return string|null A completed `<link />` element, or null if the element was sent to a block.
      * @link http://book.cakephp.org/3.0/en/views/helpers/html.html#creating-meta-tags
      */
     public function meta($type, $content = null, array $options = [])
     {
-        $options += ['block' => null];
-
         if (!is_array($type)) {
             $types = [
                 'rss' => ['type' => 'application/rss+xml', 'rel' => 'alternate', 'title' => $type, 'link' => $content],
@@ -269,7 +268,7 @@ public function meta($type, $content = null, array $options = [])
             }
         }
 
-        $options += $type;
+        $options += $type + ['block' => null];
         $out = null;
 
         if (isset($options['link'])) {

tests/TestCase/View/Helper/HtmlHelperTest.php

@@ -1767,6 +1767,25 @@ public function testMetaWithBlocks()
         $this->assertNull($result);
     }
 
+    /**
+     * Test meta() with custom tag and block argument
+     */
+    public function testMetaCustomWithBlock()
+    {
+        $this->View->expects($this->at(0))
+            ->method('append')
+            ->with('meta', $this->stringContains('og:site_name'));
+        $this->View->expects($this->at(1))
+            ->method('append')
+            ->with('meta', $this->stringContains('og:description'));
+
+        $result = $this->Html->meta(['property' => 'og:site_name', 'content' => 'CakePHP', 'block' => true]);
+        $this->assertNull($result, 'compact style should work');
+
+        $result = $this->Html->meta(['property' => 'og:description', 'content' => 'CakePHP'], null, ['block' => true]);
+        $this->assertNull($result, 'backwards compat style should work.');
+    }
+
     /**
      * testTableHeaders method
      *