media/gpu/test: Fix member var not being initialized in video decoder tests.

This CL fixes a member variable not being properly initialized in the
video decoder tests before first using it. In practice this shouldn't
have caused any bugs.

TEST=./video_decode_accelerator_tests on hana

BUG=None

Change-Id: I9ff4cf8e8415322a78ccd66d699e86a47e191f6d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2087854Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: David Staessens <dstaessens@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747139}

media/gpu/test/video_player/video_player.cc

@@ -129,7 +129,7 @@ void VideoPlayer::Play() {
   DVLOGF(4);
 
   // Play until the end of the video.
-  PlayUntil(VideoPlayerEvent::kNumEvents, 0);
+  PlayUntil(VideoPlayerEvent::kNumEvents, std::numeric_limits<size_t>::max());
 }
 
 void VideoPlayer::PlayUntil(VideoPlayerEvent event, size_t event_count) {

media/gpu/test/video_player/video_player.h

@@ -5,6 +5,7 @@
 #ifndef MEDIA_GPU_TEST_VIDEO_PLAYER_VIDEO_PLAYER_H_
 #define MEDIA_GPU_TEST_VIDEO_PLAYER_VIDEO_PLAYER_H_
 
+#include <limits.h>
 #include <memory>
 #include <utility>
 #include <vector>
@@ -155,7 +156,8 @@ class VideoPlayer {
 
   // Automatically pause decoding once the video player has seen the specified
   // number of events occur.
-  std::pair<VideoPlayerEvent, size_t> play_until_;
+  std::pair<VideoPlayerEvent, size_t> play_until_{
+      VideoPlayerEvent::kNumEvents, std::numeric_limits<size_t>::max()};
 
   SEQUENCE_CHECKER(sequence_checker_);
   DISALLOW_COPY_AND_ASSIGN(VideoPlayer);