Reset isFirstFrameRendered on init of SurfaceViewRenderer

If a SurfaceViewRenderer is reinitialized, the onFirstFrameRendered
callback is not fired.

Ensure that we reset the flag when the SurfaceViewRenderer is
initialized.

BUG=webrtc:7985

Review-Url: https://codereview.webrtc.org/2981793002
Cr-Commit-Position: refs/heads/master@{#19016}
diff --git a/AUTHORS b/AUTHORS
index 3a17351..8c7e4d7 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -10,6 +10,7 @@
 Ben Strong <bstrong@gmail.com>
 Bob Withers <bwit@pobox.com>
 Bridger Maxwell <bridgeyman@gmail.com>
+Chris Tserng <tserng@amazon.com>
 Christophe Dumez <ch.dumez@samsung.com>
 Cody Barnes <conceptgenesis@gmail.com>
 Colin Plumb