diff --git a/webrtc/modules/desktop_capture/BUILD.gn b/webrtc/modules/desktop_capture/BUILD.gn
index 0ccb18a13..bb219e2b9 100644
--- a/webrtc/modules/desktop_capture/BUILD.gn
+++ b/webrtc/modules/desktop_capture/BUILD.gn
@@ -6,14 +6,121 @@
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
+import("//build/config/ui.gni")
 import("../../build/webrtc.gni")
 
-source_set("desktop_capture") {
-  # TODO(jiayl): Implement.
-}
+use_desktop_capture_differ_sse2 =
+    (!is_ios && (cpu_arch == "x86" || cpu_arch == "x64"))
 
-if (!is_ios && (cpu_arch == "x86" || cpu_arch == "x64")) {
-  source_set("desktop_capture_differ_sse2") {
-    # TODO(jiayl): Implement.
+source_set("desktop_capture") {
+  sources = [
+    "desktop_and_cursor_composer.cc",
+    "desktop_and_cursor_composer.h",
+    "desktop_capture_types.h",
+    "desktop_capturer.h",
+    "desktop_frame.cc",
+    "desktop_frame.h",
+    "desktop_frame_win.cc",
+    "desktop_frame_win.h",
+    "desktop_geometry.cc",
+    "desktop_geometry.h",
+    "desktop_capture_options.h",
+    "desktop_capture_options.cc",
+    "desktop_capturer.h",
+    "desktop_region.cc",
+    "desktop_region.h",
+    "differ.cc",
+    "differ.h",
+    "differ_block.cc",
+    "differ_block.h",
+    "mac/desktop_configuration.h",
+    "mac/desktop_configuration.mm",
+    "mac/desktop_configuration_monitor.h",
+    "mac/desktop_configuration_monitor.cc",
+    "mac/osx_version.h",
+    "mac/osx_version.cc",
+    "mac/scoped_pixel_buffer_object.cc",
+    "mac/scoped_pixel_buffer_object.h",
+    "mouse_cursor.cc",
+    "mouse_cursor.h",
+    "mouse_cursor_monitor.h",
+    "mouse_cursor_monitor_mac.mm",
+    "mouse_cursor_monitor_win.cc",
+    "mouse_cursor_shape.h",
+    "screen_capture_frame_queue.cc",
+    "screen_capture_frame_queue.h",
+    "screen_capturer.cc",
+    "screen_capturer.h",
+    "screen_capturer_helper.cc",
+    "screen_capturer_helper.h",
+    "screen_capturer_mac.mm",
+    "screen_capturer_win.cc",
+    "shared_desktop_frame.cc",
+    "shared_desktop_frame.h",
+    "shared_memory.cc",
+    "shared_memory.h",
+    "win/cursor.cc",
+    "win/cursor.h",
+    "win/desktop.cc",
+    "win/desktop.h",
+    "win/scoped_gdi_object.h",
+    "win/scoped_thread_desktop.cc",
+    "win/scoped_thread_desktop.h",
+    "win/screen_capturer_win_gdi.cc",
+    "win/screen_capturer_win_gdi.h",
+    "win/screen_capturer_win_magnifier.cc",
+    "win/screen_capturer_win_magnifier.h",
+    "win/screen_capture_utils.cc",
+    "win/screen_capture_utils.h",
+    "win/window_capture_utils.cc",
+    "win/window_capture_utils.h",
+    "window_capturer.cc",
+    "window_capturer.h",
+    "window_capturer_mac.mm",
+    "window_capturer_win.cc",
+  ]
+
+  if (use_x11) {
+    sources += [
+      "mouse_cursor_monitor_x11.cc",
+      "screen_capturer_x11.cc",
+      "window_capturer_x11.cc",
+      "x11/shared_x_display.h",
+      "x11/shared_x_display.cc",
+      "x11/x_error_trap.cc",
+      "x11/x_error_trap.h",
+      "x11/x_server_pixel_buffer.cc",
+      "x11/x_server_pixel_buffer.h",
+    ]
+    configs += ["//build/config/linux:x11"]
+  }
+
+  if (!is_win && !is_mac && !use_x11) {
+    sources += [
+      "mouse_cursor_monitor_null.cc",
+      "screen_capturer_null.cc",
+      "window_capturer_null.cc",
+    ]
+  }
+
+  deps = ["../../system_wrappers"]
+
+  if (use_desktop_capture_differ_sse2) {
+    deps += [":desktop_capture_differ_sse2"]
+  }
+}
+
+if (use_desktop_capture_differ_sse2) {
+  # Have to be compiled as a separate target because it needs to be compiled
+  # with SSE2 enabled.
+  source_set("desktop_capture_differ_sse2") {
+    sources = [
+      "differ_block_sse2.cc",
+      "differ_block_sse2.h",
+    ]
+
+    if (is_posix && !is_mac) {
+      cflags = ["-msse2"]
+    }
   }
 }