[BrowserKit] Handle deprecations triggered in insulated requests

Author: nicolas-grekas

Client.php

@@ -343,9 +343,23 @@ public function request($method, $uri, array $parameters = array(), array $files
      */
     protected function doRequestInProcess($request)
     {
+        $deprecationsFile = tempnam(sys_get_temp_dir(), 'deprec');
+        putenv('SYMFONY_DEPRECATIONS_SERIALIZE='.$deprecationsFile);
         $process = new PhpProcess($this->getScript($request), null, null);
         $process->run();
 
+        if (file_exists($deprecationsFile)) {
+            $deprecations = file_get_contents($deprecationsFile);
+            unlink($deprecationsFile);
+            foreach ($deprecations ? unserialize($deprecations) : array() as $deprecation) {
+                if ($deprecation[0]) {
+                    trigger_error($deprecation[1], E_USER_DEPRECATED);
+                } else {
+                    @trigger_error($deprecation[1], E_USER_DEPRECATED);
+                }
+            }
+        }
+
         if (!$process->isSuccessful() || !preg_match('/^O\:\d+\:/', $process->getOutput())) {
             throw new \RuntimeException(sprintf('OUTPUT: %s ERROR OUTPUT: %s', $process->getOutput(), $process->getErrorOutput()));
         }