Disable cocoapods stats in Podfile template (#13945)

examples/flutter_gallery/ios/Podfile

 # Uncomment this line to define a global platform for your project
 # platform :ios, '9.0'
 
-if ENV['FLUTTER_FRAMEWORK_DIR'] == nil
-  abort('Please set FLUTTER_FRAMEWORK_DIR to the directory containing Flutter.framework')
-end
-
-target 'Runner' do
-  use_frameworks!
-
-  # Pods for Runner
+# CocoaPods analytics sends network stats synchronously affecting flutter build latency.
+ENV['COCOAPODS_DISABLE_STATS'] = 'true'
 
-  # Flutter Pods
-  pod 'Flutter', :path => ENV['FLUTTER_FRAMEWORK_DIR']
-
-  if File.exists? '../.flutter-plugins'
-    flutter_root = File.expand_path('..')
-    File.foreach('../.flutter-plugins') { |line|
-      plugin = line.split(pattern='=')
+def parse_KV_file(file,seperator='=')
+  file_abs_path = File.expand_path(file)
+  if !File.exists? file_abs_path
+    return [];
+  end
+  pods_ary = []
+  skip_line_start_symbols = ["#", "/"]
+  File.foreach(file_abs_path) { |line|
+      next if skip_line_start_symbols.any? { |symbol| line =~ /^\s*#{symbol}/ }
+      plugin = line.split(pattern=seperator)
       if plugin.length == 2
-        name = plugin[0].strip()
+        podname = plugin[0].strip()
         path = plugin[1].strip()
-        resolved_path = File.expand_path("#{path}/ios", flutter_root)
-        pod name, :path => resolved_path
+        podpath = File.expand_path("#{path}", file_abs_path)
+        pods_ary.push({:name => podname,:path=>podpath});
       else
         puts "Invalid plugin specification: #{line}"
       end
   }
+  return pods_ary
+end
+
+target 'Runner' do
+  # Flutter Pods
+  generated_xcode_build_settings = parse_KV_file("./Flutter/Generated.xcconfig")
+  if generated_xcode_build_settings.empty?
+    puts "Generated.xcconfig must exist. If you're running pod install manually, make sure flutter build or flutter run is executed once first."
+  end
+  generated_xcode_build_settings.map{ |p|
+    if p[:name]=='FLUTTER_FRAMEWORK_DIR'
+      pod 'Flutter', :path => p[:path]
     end
+  }
+
+  # Plugin Pods
+  plugin_pods = parse_KV_file("../.flutter-plugins")
+  plugin_pods.map{ |p|
+    pod p[:name], :path => File.expand_path("ios",p[:path])
+  }
 end
 
 post_install do |installer|

packages/flutter_tools/templates/cocoapods/Podfile-objc

 # Uncomment this line to define a global platform for your project
 # platform :ios, '9.0'
 
+# CocoaPods analytics sends network stats synchronously affecting flutter build latency.
+ENV['COCOAPODS_DISABLE_STATS'] = 'true'
+
 def parse_KV_file(file,seperator='=')
   file_abs_path = File.expand_path(file)
   if !File.exists? file_abs_path

packages/flutter_tools/templates/cocoapods/Podfile-swift

 # Uncomment this line to define a global platform for your project
 # platform :ios, '9.0'
 
+# CocoaPods analytics sends network stats synchronously affecting flutter build latency.
+ENV['COCOAPODS_DISABLE_STATS'] = 'true'
+
 def parse_KV_file(file,seperator='=')
   file_abs_path = File.expand_path(file)
   if !File.exists? file_abs_path