Revert of [Mojo Video Capture] Simplify media::VideoCaptureDevice::Client:Buffer to a struct

media/capture/video/shared_memory_buffer_tracker.cc

Index: media/capture/video/shared_memory_buffer_tracker.cc
diff --git a/media/capture/video/shared_memory_buffer_tracker.cc b/media/capture/video/shared_memory_buffer_tracker.cc
index 2adfb0ef6efccc459aa0f92ce34c2ff9f79e24d9..d21e35d7863f9005de4b08b04262f14f827678d9 100644
--- a/media/capture/video/shared_memory_buffer_tracker.cc
+++ b/media/capture/video/shared_memory_buffer_tracker.cc
@@ -30,7 +30,7 @@
 }
 
 std::unique_ptr<VideoCaptureBufferHandle>
-SharedMemoryBufferTracker::GetMemoryMappedAccess() {
+SharedMemoryBufferTracker::GetBufferHandle() {
   return base::MakeUnique<SharedMemoryBufferHandle>(this);
 }
 
@@ -47,16 +47,31 @@
 
 SharedMemoryBufferHandle::~SharedMemoryBufferHandle() = default;
 
+gfx::Size SharedMemoryBufferHandle::dimensions() const {
+  return tracker_->dimensions();
+}
+
 size_t SharedMemoryBufferHandle::mapped_size() const {
   return tracker_->mapped_size_;
 }
 
-uint8_t* SharedMemoryBufferHandle::data() {
-  return static_cast<uint8_t*>(tracker_->shared_memory_.memory());
+void* SharedMemoryBufferHandle::data(int plane) {
+  DCHECK_EQ(0, plane);
+  return tracker_->shared_memory_.memory();
 }
 
-const uint8_t* SharedMemoryBufferHandle::data() const {
-  return static_cast<const uint8_t*>(tracker_->shared_memory_.memory());
+#if defined(OS_POSIX) && !defined(OS_MACOSX)
+base::FileDescriptor SharedMemoryBufferHandle::AsPlatformFile() {
+  return tracker_->shared_memory_.handle();
+}
+#endif
+
+bool SharedMemoryBufferHandle::IsBackedByVideoFrame() const {
+  return false;
+}
+
+scoped_refptr<VideoFrame> SharedMemoryBufferHandle::GetVideoFrame() {
+  return scoped_refptr<VideoFrame>();
 }
 
 }  // namespace media