Add new file option php_namespace. (#3162)

* Add new file option php_namespace.

Use this option to change the namespace of php generated classes.
Default is empty. When this option is empty, the package name will be
used for determining the namespace.

* Uncomment commented tests

* Revert gdb test change

* Update csharp descriptor.

* Add test for empty php_namespace.

1 files changed, 8 insertions, 0 deletions

diff --git a/php/src/Google/Protobuf/Internal/GeneratedCodeInfo_Annotation.php b/php/src/Google/Protobuf/Internal/GeneratedCodeInfo_Annotation.php
index ed22cc38..8d227e1c 100644
--- a/php/src/Google/Protobuf/Internal/GeneratedCodeInfo_Annotation.php
+++ b/php/src/Google/Protobuf/Internal/GeneratedCodeInfo_Annotation.php
@@ -88,6 +88,8 @@ class GeneratedCodeInfo_Annotation extends \Google\Protobuf\Internal\Message
         $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::INT32);
         $this->path = $arr;
         $this->has_path = true;
+
+        return $this;
     }
 
     public function hasPath()
@@ -119,6 +121,8 @@ class GeneratedCodeInfo_Annotation extends \Google\Protobuf\Internal\Message
         GPBUtil::checkString($var, True);
         $this->source_file = $var;
         $this->has_source_file = true;
+
+        return $this;
     }
 
     public function hasSourceFile()
@@ -152,6 +156,8 @@ class GeneratedCodeInfo_Annotation extends \Google\Protobuf\Internal\Message
         GPBUtil::checkInt32($var);
         $this->begin = $var;
         $this->has_begin = true;
+
+        return $this;
     }
 
     public function hasBegin()
@@ -187,6 +193,8 @@ class GeneratedCodeInfo_Annotation extends \Google\Protobuf\Internal\Message
         GPBUtil::checkInt32($var);
         $this->end = $var;
         $this->has_end = true;
+
+        return $this;
     }
 
     public function hasEnd()