MediaPerceptionPrivate API impl and testing.

extensions/test/data/media_perception_private/state/runtest.js

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+function getStateUninitialized() {
+  chrome.mediaPerceptionPrivate.getState(
+      chrome.test.callbackPass(function(state) {
+        chrome.test.assertEq({ status: 'UNINITIALIZED' }, state);
+      }));
+}
+
+function setStateRunning() {
+  chrome.mediaPerceptionPrivate.setState({
+    status: 'RUNNING',
+    deviceContext: 'device_context'
+  }, chrome.test.callbackPass(function(state) {
+    chrome.test.assertEq('RUNNING', state.status);
+  }));
+}
+
+function getStateRunning() {
+  chrome.mediaPerceptionPrivate.getState(
+      chrome.test.callbackPass(function(state) {
+        chrome.test.assertEq('RUNNING', state.status);
+      }));
+}
+
+function setStateUnsettable() {
+  const error = 'Status can only be set to RUNNING and SUSPENDED.';
+  chrome.mediaPerceptionPrivate.setState({
+    status: 'UNINITIALIZED'
+  }, chrome.test.callbackFail(error));
+  chrome.mediaPerceptionPrivate.setState({
+    status: 'STARTED'
+  }, chrome.test.callbackFail(error));
+}
+
+function setStateSuspendedButWithDeviceContextFail() {
+  const error = 'Only provide deviceContext with SetState RUNNING.';
+  chrome.mediaPerceptionPrivate.setState({
+    status: 'SUSPENDED',
+    deviceContext: 'device_context'
+  }, chrome.test.callbackFail(error));
+}
+
+chrome.test.runTests([
+    getStateUninitialized,
+    setStateRunning,
+    getStateRunning,
+    setStateUnsettable,
+    setStateSuspendedButWithDeviceContextFail]);
+