Merge "Add tests for MagnificationController."

core/java/android/provider/Settings.java

...er/src/com/android/providers/settings/DatabaseHelper.java

.../src/com/android/providers/settings/SettingsProvider.java

...oid/server/accessibility/AccessibilityManagerService.java

...android/server/accessibility/MagnificationController.java

...oid/server/accessibility/MagnificationGestureHandler.java

...oid/server/accessibility/MagnificationControllerTest.java

...android/server/accessibility/MessageCapturingHandler.java

...android/server/accessibility/MotionEventInjectorTest.java