Use libgav1 in cdm_video_decoder.cc and unit tests

  $ gn args out/Default
  # In the editor, add the following build argument:
  # enable_libgav1_decoder = true
  $ autoninja -C out/Default media_unittests
  $ out/Default/media_unittests
  $ out/Default/media_unittests --enable-features=Gav1VideoDecoder

Tested: 
Bug: 1026522
Change-Id: I2b033b5993b69a5e58d670434726d9e8d8b69e6a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2040434Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Wan-Teh Chang <wtc@google.com>
Cr-Commit-Position: refs/heads/master@{#738854}

media/cdm/library_cdm/clear_key_cdm/cdm_video_decoder.cc

@@ -10,6 +10,7 @@
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/containers/queue.h"
+#include "base/feature_list.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/no_destructor.h"
@@ -21,6 +22,7 @@
 #include "base/task/single_thread_task_executor.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "media/base/decode_status.h"
+#include "media/base/media_switches.h"
 #include "media/base/media_util.h"
 #include "media/cdm/cdm_type_conversion.h"
 #include "media/cdm/library_cdm/cdm_host_proxy.h"
@@ -44,6 +46,10 @@
 #include "media/filters/ffmpeg_video_decoder.h"
 #endif
 
+#if BUILDFLAG(ENABLE_LIBGAV1_DECODER)
+#include "media/filters/gav1_video_decoder.h"
+#endif
+
 namespace media {
 
 namespace {
@@ -304,6 +310,13 @@ std::unique_ptr<CdmVideoDecoder> CreateVideoDecoder(
     video_decoder.reset(new VpxVideoDecoder());
 #endif
 
+#if BUILDFLAG(ENABLE_LIBGAV1_DECODER)
+  if (base::FeatureList::IsEnabled(kGav1VideoDecoder)) {
+    if (config.codec == cdm::kCodecAv1)
+      video_decoder.reset(new Gav1VideoDecoder(null_media_log.get()));
+  } else
+#endif  // BUILDFLAG(ENABLE_LIBGAV1_DECODER)
+  {
 #if BUILDFLAG(ENABLE_DAV1D_DECODER)
     if (config.codec == cdm::kCodecAv1)
       video_decoder.reset(new Dav1dVideoDecoder(null_media_log.get()));
@@ -311,6 +324,7 @@ std::unique_ptr<CdmVideoDecoder> CreateVideoDecoder(
     if (config.codec == cdm::kCodecAv1)
       video_decoder.reset(new AomVideoDecoder(null_media_log.get()));
 #endif
+  }
 
 #if BUILDFLAG(ENABLE_FFMPEG)
   if (!video_decoder)

media/test/pipeline_integration_test_base.cc

@@ -9,6 +9,7 @@
 
 #include "base/bind.h"
 #include "base/callback.h"
+#include "base/feature_list.h"
 #include "base/memory/ref_counted.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
@@ -48,6 +49,10 @@
 #include "media/filters/vpx_video_decoder.h"
 #endif
 
+#if BUILDFLAG(ENABLE_LIBGAV1_DECODER)
+#include "media/filters/gav1_video_decoder.h"
+#endif
+
 using ::testing::_;
 using ::testing::AnyNumber;
 using ::testing::AtLeast;
@@ -74,12 +79,20 @@ static std::vector<std::unique_ptr<VideoDecoder>> CreateVideoDecodersForTest(
   video_decoders.push_back(std::make_unique<OffloadingVpxVideoDecoder>());
 #endif
 
+#if BUILDFLAG(ENABLE_LIBGAV1_DECODER)
+  if (base::FeatureList::IsEnabled(kGav1VideoDecoder)) {
+    video_decoders.push_back(
+        std::make_unique<OffloadingGav1VideoDecoder>(media_log));
+  } else
+#endif  // BUILDFLAG(ENABLE_LIBGAV1_DECODER)
+  {
 #if BUILDFLAG(ENABLE_DAV1D_DECODER)
     video_decoders.push_back(
         std::make_unique<OffloadingDav1dVideoDecoder>(media_log));
 #elif BUILDFLAG(ENABLE_LIBAOM_DECODER)
     video_decoders.push_back(std::make_unique<AomVideoDecoder>(media_log));
 #endif
+  }
 
 #if BUILDFLAG(ENABLE_FFMPEG_VIDEO_DECODERS)
   video_decoders.push_back(std::make_unique<FFmpegVideoDecoder>(media_log));