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This patch provides platform sensor's default configuration to the Blink side at 'SensorProxy' initialization stage.
Default configuration will be used for sensors construction by default, e.g. 'let sensor = new AmbientLightSensor();'.

A few related changes are added as well:
- Rename 'SensorReadBuffer' to 'SensorInitParams'
- Remove repeated code calling 'startListening()' from 'Sensor::onSensorInitialized()'
- Call 'reset()' for all 'SensorProxy' members from 'SensorProxy::handleSensorError()'

BUG=606766

Review-Url: https://codereview.chromium.org/2330943002
Cr-Commit-Position: refs/heads/master@{#418528}