Extract nested and private classes from VideoCaptureBufferPool

content/browser/BUILD.gn

Index: content/browser/BUILD.gn
diff --git a/content/browser/BUILD.gn b/content/browser/BUILD.gn
index 374866d381ccc69db39d03d29f4592fad6abc4e8..c3c2a7f059f69e565715df248767fa171ed22b50 100644
--- a/content/browser/BUILD.gn
+++ b/content/browser/BUILD.gn
@@ -1048,6 +1048,10 @@ source_set("browser") {
     "renderer_host/media/audio_renderer_host.h",
     "renderer_host/media/audio_sync_reader.cc",
     "renderer_host/media/audio_sync_reader.h",
+    "renderer_host/media/gpu_memory_buffer_handle.cc",
+    "renderer_host/media/gpu_memory_buffer_handle.h",
+    "renderer_host/media/gpu_memory_buffer_tracker.cc",
+    "renderer_host/media/gpu_memory_buffer_tracker.h",
     "renderer_host/media/media_capture_devices_impl.cc",
     "renderer_host/media/media_capture_devices_impl.h",
     "renderer_host/media/media_stream_dispatcher_host.cc",
@@ -1060,8 +1064,16 @@ source_set("browser") {
     "renderer_host/media/media_stream_track_metrics_host.h",
     "renderer_host/media/media_stream_ui_proxy.cc",
     "renderer_host/media/media_stream_ui_proxy.h",
+    "renderer_host/media/shared_memory_buffer_handle.cc",
+    "renderer_host/media/shared_memory_buffer_handle.h",
+    "renderer_host/media/shared_memory_buffer_tracker.cc",
+    "renderer_host/media/shared_memory_buffer_tracker.h",
+    "renderer_host/media/video_capture_buffer_handle.h",
     "renderer_host/media/video_capture_buffer_pool.cc",
     "renderer_host/media/video_capture_buffer_pool.h",
+    "renderer_host/media/video_capture_buffer_tracker.h",
+    "renderer_host/media/video_capture_buffer_tracker_factory.cc",
+    "renderer_host/media/video_capture_buffer_tracker_factory.h",
     "renderer_host/media/video_capture_controller.cc",
     "renderer_host/media/video_capture_controller.h",
     "renderer_host/media/video_capture_controller_event_handler.h",