2972 [integration_test] Fix channel name for iOS, docs (cla: yes)

2974 [url_launcher_platform_interface] Add webOnlyWindowName parameter to launch() (cla: yes, waiting for test harness)

2975 [battery_platform_interface] Introduce package. (cla: yes)

2977 [flutter_plugin_android_lifecycle] add no-op v2 plugin (cla: yes)

2979 [url_launcher]Added webOnlyWindowName parameter to launch()  (cla: yes)

2980 [battery] Port battery to use platform interface (cla: yes)

2984 [url_launcher, url_launcher_web] Fix API dependencies. (cla: yes, waiting for test harness)