Add null check for failed media::VideoFrame creation.

R=chcunningham

Fixed: 1164070
Change-Id: Ib3227d36de787bca195cffdb500f3688b3209cbf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2616999
Auto-Submit: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Chrome Cunningham <chcunningham@chromium.org>
Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841367}

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

@@ -213,6 +213,11 @@ VideoFrame* VideoFrame::Create(ScriptState* script_state,
         // a VideoFrame instead of using writable_addr() here.
         reinterpret_cast<uint8_t*>(pm.writable_addr()), pm.computeByteSize(),
         timestamp);
+    if (!frame) {
+      exception_state.ThrowDOMException(DOMExceptionCode::kOperationError,
+                                        "Failed to create video frame");
+      return nullptr;
+    }
     frame->set_color_space(gfx::ColorSpace(*sk_color_space));
     frame->AddDestructionObserver(ConvertToBaseOnceCallback(CrossThreadBindOnce(
         base::DoNothing::Once<sk_sp<SkImage>>(), std::move(sk_image))));