Moved buffer for VIEW_TEXT_CHANGED events to MainContentCaptureSession.

Bug: 121042846
Test: atest android.contentcaptureservice.cts.LoginActivityTest#testTextChangeBuffer
Test: atest CtsContentCaptureServiceTestCases
Change-Id: Ia0128c1c868d44da954e67b38dfb2bde6461b883
1 file changed