Handle scaling frames in RTCVideoEncoder

media/renderers/mock_gpu_video_accelerator_factories.cc

Index: media/renderers/mock_gpu_video_accelerator_factories.cc
diff --git a/media/renderers/mock_gpu_video_accelerator_factories.cc b/media/renderers/mock_gpu_video_accelerator_factories.cc
index 603839b619c9e3e920e7ce1fbbf90219e3c81a41..e63d5bab007d78093863318a503dbdc2bada6153 100644
--- a/media/renderers/mock_gpu_video_accelerator_factories.cc
+++ b/media/renderers/mock_gpu_video_accelerator_factories.cc
@@ -101,6 +101,9 @@ MockGpuVideoAcceleratorFactories::AllocateGpuMemoryBuffer(
 
 std::unique_ptr<base::SharedMemory>
 MockGpuVideoAcceleratorFactories::CreateSharedMemory(size_t size) {
+  std::unique_ptr<base::SharedMemory> shared_memory(new base::SharedMemory);
+  if (shared_memory->CreateAndMapAnonymous(size))
+    return shared_memory;
   return nullptr;
 }