9324 Send the isolate service ID from the engine to the embedder (cla: yes)

9326 Fix rawTypes errors in Android embedding classes (cla: yes)

9329 Fixed memory leak by way of accidental retain on implicit self (cla: yes)

9330 Build txt_benchmarks, make benches compile again (cla: yes)

9331 Handle one-way platform messages in the embedder library (cla: yes)

9334 Fix the name of the channel parameter in PlatformMessage constructors (cla: yes)

9335 Message loop task heaps are shared (cla: yes)

9336 Roll buildroot to d1bbc14 to pick up fixes for armv7 iOS targets. (cla: yes)

9337 Use the DartServiceIsolate status callback to publish the observatory URI to the Android embedder (cla: yes)