media/gpu/test: Add allocate-mode testcase to new video decoder tests.

This CL adds a new test to the video_decode_accelerator_tests binary, which
tests decoding a video in allocate mode. This test is automatically skipped on
platforms that only support allocate mode, which already run all tests in
allocate mode.

TEST=./video_decode_accelerator_tests on eve

BUG=953122

Change-Id: I82347bc7230ab9afed26199d43e55954b4a4558b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1688750
Commit-Queue: David Staessens <dstaessens@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676244}

media/gpu/video_decode_accelerator_tests.cc

@@ -285,6 +285,27 @@ TEST_F(VideoDecoderTest, FlushAtEndOfStream_RenderThumbnails) {
                   ->ValidateThumbnail());
 }
 
+// Play a video from start to finish, using allocate mode. This test is only run
+// on platforms that support import mode, as on allocate-mode only platforms all
+// tests are run in allocate mode. The test will be skipped when --use_vd is
+// specified as the new video decoders only support import mode.
+// TODO(dstaessens): Deprecate after switching to new VD-based video decoders.
+TEST_F(VideoDecoderTest, FlushAtEndOfStream_Allocate) {
+  if (!g_env->ImportSupported() || g_env->UseVD())
+    GTEST_SKIP();
+
+  VideoDecoderClientConfig config;
+  config.allocation_mode = AllocationMode::kAllocate;
+  auto tvp = CreateVideoPlayer(g_env->Video(), config);
+
+  tvp->Play();
+  EXPECT_TRUE(tvp->WaitForFlushDone());
+
+  EXPECT_EQ(tvp->GetFlushDoneCount(), 1u);
+  EXPECT_EQ(tvp->GetFrameDecodedCount(), g_env->Video()->NumFrames());
+  EXPECT_TRUE(tvp->WaitForFrameProcessors());
+}
+
 }  // namespace test
 }  // namespace media