Update Gallery plugin integration (#9823)

Enable plugin infra for both iOS and Android post-#9791.

dev/devicelab/lib/tasks/perf_tests.dart

@@ -65,7 +65,7 @@ TaskFunction createGalleryBackButtonMemoryTest() {
   return new AndroidBackButtonMemoryTest(
     '${flutterDirectory.path}/examples/flutter_gallery',
     'io.flutter.examples.gallery',
-    'io.flutter.app.FlutterActivity',
+    'io.flutter.examples.gallery.MainActivity',
   );
 }
 

examples/flutter_gallery/android/app/src/main/AndroidManifest.xml

@@ -22,7 +22,7 @@
          additional functionality it is fine to subclass or reimplement
          FlutterApplication and put your custom class here. -->
     <application android:name="io.flutter.app.FlutterApplication" android:label="Gallery" android:icon="@mipmap/ic_launcher">
-        <activity android:name="io.flutter.app.FlutterActivity"
+        <activity android:name=".MainActivity"
                   android:launchMode="singleTop"
                   android:theme="@android:style/Theme.Light.NoTitleBar"
                   android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection"

examples/flutter_gallery/android/app/src/main/java/io/flutter/examples/gallery/MainActivity.java

+package io.flutter.examples.gallery;
+
+import android.os.Bundle;
+import io.flutter.app.FlutterActivity;
+import io.flutter.plugins.PluginRegistry;
+
+public class MainActivity extends FlutterActivity {
+    PluginRegistry pluginRegistry;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        pluginRegistry = new PluginRegistry();
+        pluginRegistry.registerAll(this);
+    }
+}

examples/flutter_gallery/android/app/src/main/java/io/flutter/plugins/PluginRegistry.java

+package io.flutter.plugins;
+
+import io.flutter.app.FlutterActivity;
+
+
+/**
+ * Generated file. Do not edit.
+ */
+
+public class PluginRegistry {
+
+    public void registerAll(FlutterActivity activity) {
+    }
+}

examples/flutter_gallery/ios/Runner.xcodeproj/project.pbxproj

@@ -7,6 +7,7 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		1498D2341E8E89220040F4C2 /* PluginRegistry.m in Sources */ = {isa = PBXBuildFile; fileRef = 1498D2331E8E89220040F4C2 /* PluginRegistry.m */; };
 		3B3967161E833CAA004F5970 /* AppFrameworkInfo.plist in Resources */ = {isa = PBXBuildFile; fileRef = 3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */; };
 		3B80C3941E831B6300D905FE /* App.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 3B80C3931E831B6300D905FE /* App.framework */; };
 		3B80C3951E831B6300D905FE /* App.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 3B80C3931E831B6300D905FE /* App.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
@@ -38,6 +39,8 @@
 /* End PBXCopyFilesBuildPhase section */
 
 /* Begin PBXFileReference section */
+		1498D2321E8E86230040F4C2 /* PluginRegistry.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = PluginRegistry.h; sourceTree = "<group>"; };
+		1498D2331E8E89220040F4C2 /* PluginRegistry.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = PluginRegistry.m; sourceTree = "<group>"; };
 		3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; name = AppFrameworkInfo.plist; path = Flutter/AppFrameworkInfo.plist; sourceTree = "<group>"; };
 		3B80C3931E831B6300D905FE /* App.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = App.framework; path = Flutter/App.framework; sourceTree = "<group>"; };
 		7AFA3C8E1D35360C0083082E /* Release.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; name = Release.xcconfig; path = Flutter/Release.xcconfig; sourceTree = "<group>"; };
@@ -110,6 +113,8 @@
 				97C146FF1CF9000F007C117D /* LaunchScreen.storyboard */,
 				97C147021CF9000F007C117D /* Info.plist */,
 				97C146F11CF9000F007C117D /* Supporting Files */,
+				1498D2321E8E86230040F4C2 /* PluginRegistry.h */,
+				1498D2331E8E89220040F4C2 /* PluginRegistry.m */,
 			);
 			path = Runner;
 			sourceTree = "<group>";
@@ -239,6 +244,7 @@
 			files = (
 				978B8F6F1D3862AE00F588F7 /* AppDelegate.m in Sources */,
 				97C146F31CF9000F007C117D /* main.m in Sources */,
+				1498D2341E8E89220040F4C2 /* PluginRegistry.m in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};

examples/flutter_gallery/ios/Runner/AppDelegate.m

 #include "AppDelegate.h"
+#include "PluginRegistry.h"
 
-@implementation AppDelegate
+@implementation AppDelegate {
+  PluginRegistry *plugins;
+}
 
 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
   // Override point for customization after application launch.
+  FlutterViewController *flutterController =
+      (FlutterViewController *)self.window.rootViewController;
+  plugins = [[PluginRegistry alloc] initWithController:flutterController];
   return YES;
 }
 
 - (void)applicationWillResignActive:(UIApplication *)application {
-    // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
-    // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
+  // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
+  // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
 }
 
 - (void)applicationDidEnterBackground:(UIApplication *)application {
-    // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
-    // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
+  // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
+  // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
 }
 
 - (void)applicationWillEnterForeground:(UIApplication *)application {
-    // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
+  // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
 }
 
 - (void)applicationDidBecomeActive:(UIApplication *)application {
-    // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
+  // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
 }
 
 - (void)applicationWillTerminate:(UIApplication *)application {
-    // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
+  // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
 }
 
 @end

examples/flutter_gallery/ios/Runner/PluginRegistry.h

+//
+//  Generated file. Do not edit.
+//
+
+#ifndef PluginRegistry_h
+#define PluginRegistry_h
+
+#import <Flutter/Flutter.h>
+
+
+@interface PluginRegistry : NSObject
+
+
+- (instancetype)initWithController:(FlutterViewController *)controller;
+
+@end
+
+#endif /* PluginRegistry_h */

examples/flutter_gallery/ios/Runner/PluginRegistry.m

+//
+//  Generated file. Do not edit.
+//
+
+#import "PluginRegistry.h"
+
+@implementation PluginRegistry
+
+- (instancetype)initWithController:(FlutterViewController *)controller {
+  if (self = [super init]) {
+  }
+  return self;
+}
+
+@end