Added new APIs to let Settings enable / disable ContentCapture

Bug: 123286662
Test: atest ChildlessActivityTest#testSetContentCaptureFeatureEnabled_disabledBySettings \
        ChildlessActivityTest#testSetContentCaptureFeatureEnabled_disabledThenReEnabledBySettings\
        FrameworksCoreTests:SettingsBackupTest#secureSettingsBackedUpOrBlacklisted
Test: atest CtsContentCaptureServiceTestCases # for sanity check

Change-Id: I7cd2c36c1d7e23efb9acacf4f18cecd8838f5ac5
diff --git a/core/tests/coretests/src/android/provider/SettingsBackupTest.java b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
index bd7f852..4e71821 100644
--- a/core/tests/coretests/src/android/provider/SettingsBackupTest.java
+++ b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
@@ -605,6 +605,7 @@
                  Settings.Secure.CMAS_ADDITIONAL_BROADCAST_PKG,
                  Settings.Secure.COMPLETED_CATEGORY_PREFIX,
                  Settings.Secure.CONNECTIVITY_RELEASE_PENDING_INTENT_DELAY_MS,
+                 Settings.Secure.CONTENT_CAPTURE_ENABLED,
                  Settings.Secure.DEFAULT_INPUT_METHOD,
                  Settings.Secure.DEVICE_PAIRED,
                  Settings.Secure.DIALER_DEFAULT_APPLICATION,