Enable hardware encoding on macOS and Linux.

macOS requires a larger initial size for the encoding test to
actually succeed. Linux normally doesn't have any hardware
encoding support, but it may be enabled with a chrome://flag.

R=eugene

Fixed: 1110279
Change-Id: I05feac9fee3bb2aa76bb5e14f06b48c6b8b46a1f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537145Reviewed-by: Eugene Zemtsov <eugene@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827910}

third_party/blink/renderer/modules/webcodecs/video_encoder.cc

@@ -56,11 +56,6 @@ namespace {
 std::unique_ptr<media::VideoEncoder> CreateAcceleratedVideoEncoder(
     media::VideoCodecProfile profile,
     const media::VideoEncoder::Options& options) {
-#if defined(OS_MAC) || defined(OS_LINUX)
-  // TODO(https://crbug.com/1110279) Flush() is not implemented on MacOS'
-  // accelerated video encoder, so we can't use it yet.
-  return nullptr;
-#else
   auto* gpu_factories = Platform::Current()->GetGpuFactories();
   if (!gpu_factories || !gpu_factories->IsGpuVideoAcceleratorEnabled())
     return nullptr;
@@ -101,7 +96,6 @@ std::unique_ptr<media::VideoEncoder> CreateAcceleratedVideoEncoder(
       media::AsyncDestroyVideoEncoder<media::VideoEncodeAcceleratorAdapter>>(
       std::make_unique<media::VideoEncodeAcceleratorAdapter>(
           gpu_factories, std::move(task_runner)));
-#endif  // defined(OS_MAC) || defined(OS_LINUX)
 }
 
 std::unique_ptr<media::VideoEncoder> CreateVpxVideoEncoder() {

third_party/blink/web_tests/webcodecs/basic_video_encoding.html

@@ -45,8 +45,8 @@
     };
 
     async function encode_decode_test(codec, acc) {
-      const w = 120;
-      const h = 60;
+      const w = 640;
+      const h = 360;
       let next_ts = 0
       let frames_to_encode = 16;
       let frames_encoded = 0;
@@ -109,8 +109,8 @@
     }
 
     async function encode_test(codec, acc) {
-      let w = 120;
-      let h = 60;
+      let w = 640;
+      let h = 360;
       let next_ts = 0
       let frames_to_encode = 16;
       let frames_processed = 0;