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When an AndroidView gains focus we invoke the(newly introduced) 'TextInput.setPlatformViewClient' text_input system channel method which sets the platform view as the text input target. When the AndroidView loses focus we send a clearFocus message to platform views system channel(so the engine can clear the focus from the platform view). This PR is going to land before the engine implementation is rolled to the framework, we swallow MissingPluginException for the newly introduced method channel methods so this is a no-op before the engine is ready(after the engine is rolled with the corresponding change I'll remove the logic to swallow the exceptions). The engine counterpart is in: flutter/engine#9203