This CL adds support for extension in GYP.

test/ios/extension/ActionExtension/MainInterface.storyboard

Index: test/ios/extension/ActionExtension/MainInterface.storyboard
diff --git a/test/ios/extension/ActionExtension/MainInterface.storyboard b/test/ios/extension/ActionExtension/MainInterface.storyboard
new file mode 100644
index 0000000000000000000000000000000000000000..5aa58184e80bba378703715e381351e62df3fe14
--- /dev/null
+++ b/test/ios/extension/ActionExtension/MainInterface.storyboard
@@ -0,0 +1,63 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="6148" systemVersion="14A229a" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" initialViewController="ObA-dk-sSI">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6147"/>
+    </dependencies>
+    <scenes>
+        <!--Action View Controller - Image-->
+        <scene sceneID="7MM-of-jgj">
+            <objects>
+                <viewController title="Image" id="ObA-dk-sSI" customClass="ActionViewController" customModuleProvider="" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="qkL-Od-lgU"/>
+                        <viewControllerLayoutGuide type="bottom" id="n38-gi-rB5"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="zMn-AG-sqS">
+                        <rect key="frame" x="0.0" y="0.0" width="320" height="528"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <imageView userInteractionEnabled="NO" contentMode="scaleAspectFit" horizontalHuggingPriority="251" verticalHuggingPriority="251" translatesAutoresizingMaskIntoConstraints="NO" id="9ga-4F-77Z">
+                                <rect key="frame" x="0.0" y="64" width="320" height="464"/>
+                            </imageView>
+                            <navigationBar contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="NOA-Dm-cuz">
+                                <rect key="frame" x="0.0" y="20" width="320" height="44"/>
+                                <items>
+                                    <navigationItem id="3HJ-uW-3hn">
+                                        <barButtonItem key="leftBarButtonItem" title="Done" style="done" id="WYi-yp-eM6">
+                                            <connections>
+                                                <action selector="done" destination="ObA-dk-sSI" id="Qdu-qn-U6V"/>
+                                            </connections>
+                                        </barButtonItem>
+                                    </navigationItem>
+                                </items>
+                            </navigationBar>
+                        </subviews>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
+                        <constraints>
+                            <constraint firstAttribute="trailing" secondItem="NOA-Dm-cuz" secondAttribute="trailing" id="A05-Pj-hrr"/>
+                            <constraint firstItem="9ga-4F-77Z" firstAttribute="top" secondItem="NOA-Dm-cuz" secondAttribute="bottom" id="Fps-3D-QQW"/>
+                            <constraint firstItem="NOA-Dm-cuz" firstAttribute="leading" secondItem="zMn-AG-sqS" secondAttribute="leading" id="HxO-8t-aoh"/>
+                            <constraint firstAttribute="trailing" secondItem="9ga-4F-77Z" secondAttribute="trailing" id="Ozw-Hg-0yh"/>
+                            <constraint firstItem="9ga-4F-77Z" firstAttribute="leading" secondItem="zMn-AG-sqS" secondAttribute="leading" id="XH5-ld-ONA"/>
+                            <constraint firstItem="n38-gi-rB5" firstAttribute="top" secondItem="9ga-4F-77Z" secondAttribute="bottom" id="eQg-nn-Zy4"/>
+                            <constraint firstItem="NOA-Dm-cuz" firstAttribute="top" secondItem="qkL-Od-lgU" secondAttribute="bottom" id="we0-1t-bgp"/>
+                        </constraints>
+                    </view>
+                    <freeformSimulatedSizeMetrics key="simulatedDestinationMetrics"/>
+                    <size key="freeformSize" width="320" height="528"/>
+                    <connections>
+                        <outlet property="imageView" destination="9ga-4F-77Z" id="5y6-5w-9QO"/>
+                        <outlet property="view" destination="zMn-AG-sqS" id="Qma-de-2ek"/>
+                    </connections>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="X47-rx-isc" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="252" y="-124"/>
+        </scene>
+    </scenes>
+    <simulatedMetricsContainer key="defaultSimulatedMetrics">
+        <simulatedStatusBarMetrics key="statusBar"/>
+        <simulatedOrientationMetrics key="orientation"/>
+        <simulatedScreenMetrics key="destination" type="retina4"/>
+    </simulatedMetricsContainer>
+</document>