Add source module to UWP logging output
Updated support/hololens/Servo.cpp to use url: google.com
New debug output:
```
RUST: DEBUG - html5ever::tokenizer - got characters None
RUST: DEBUG - script::script_thread - Processing event FromConstellation(ConstellationControlMsg::NavigationResponse).
RUST: DEBUG - html5ever::tokenizer - processing in state RawData(ScriptData)
```
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Magic Leap developer ergonomic improvements
These changes allow passing in command line arguments for Servo via a SERVO_ARGS from the mldb terminal when launching the activity, as well as passing in a launch URL as an argument. It also redirects stdout to the ML log, which allows observing the built-in profiler output.
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Support for ExternalVR implementation
This PR adds the hook necessary for the ExternalVR rust-webvr driver.
Waiting on rust-webvr 0.9.3 to be published before landing.
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Fix daydream support
Added a googlevr-flavor AndroidManifest.xml for servoapp (this gets
merged with the main one). Daydream works now.
I haven't added an oculus one since as far as I can tell we don't
support pure servo on oculus yet.
r? @jdm @paulrouget
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shutdown synchronously
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Currently on Android we treat all touch events as scroll events. Servo
is already capable of distinguishing between scroll-touches and regular
touch events (see `on_touch_move` in `components/compositor/touch.rs`),
so we should just be passing touch events through.
Servo however does not natively support fling gestures, so we continue
to use `GestureDetector` for that.
