Add experimental/pedometer (#1587)

* Add `experimental/pedometer`

* Fixup for linter warnings

* Update CI config

experimental/pedometer/ios/Classes/dart_api_dl.c

@@ -0,0 +1,2 @@
+#include "../../src/dart-sdk/include/dart_api_dl.c"
+

experimental/pedometer/ios/Classes/pedometerHelper.m

@@ -0,0 +1,3 @@
+// Relative import to be able to reuse the C sources.
+// See the comment in ../{projectName}}.podspec for more information.
+ #include "../../src/pedometerHelper.m"

experimental/pedometer/ios/pedometer.podspec

@@ -0,0 +1,29 @@
+#
+# To learn more about a Podspec see http://guides.cocoapods.org/syntax/podspec.html.
+# Run `pod lib lint pedometer.podspec` to validate before publishing.
+#
+Pod::Spec.new do |s|
+  s.name             = 'pedometer'
+  s.version          = '0.0.1'
+  s.summary          = 'A new Flutter FFI plugin project.'
+  s.description      = <<-DESC
+A new Flutter FFI plugin project.
+                       DESC
+  s.homepage         = 'http://example.com'
+  s.license          = { :file => '../LICENSE' }
+  s.author           = { 'Your Company' => 'email@example.com' }
+
+  # This will ensure the source files in Classes/ are included in the native
+  # builds of apps using this FFI plugin. Podspec does not support relative
+  # paths, so Classes contains a forwarder C file that relatively imports
+  # `../src/*` so that the C sources can be shared among all target platforms.
+  s.source           = { :path => '.' }
+  s.source_files = 'Classes/**/*'
+  s.dependency 'Flutter'
+  s.platform = :ios, '9.0'
+  s.requires_arc = []
+
+  # Flutter.framework does not contain a i386 slice.
+  s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES', 'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'i386' }
+  s.swift_version = '5.0'
+end