BlankDetectorDesktopCapturerWrapper to detect a blank DesktopFrame

webrtc/modules/desktop_capture/BUILD.gn

Index: webrtc/modules/desktop_capture/BUILD.gn
diff --git a/webrtc/modules/desktop_capture/BUILD.gn b/webrtc/modules/desktop_capture/BUILD.gn
index 151627de3913f93ae8e5f5ac91f0befbbc16cffd..3f3130dd4d8efa0d4bae645131734d8774c198af 100644
--- a/webrtc/modules/desktop_capture/BUILD.gn
+++ b/webrtc/modules/desktop_capture/BUILD.gn
@@ -58,6 +58,7 @@ if (rtc_include_tests) {
   rtc_source_set("desktop_capture_unittests") {
     testonly = true
     sources = [
+      "blank_detector_desktop_capturer_wrapper_unittest.cc",
       "desktop_and_cursor_composer_unittest.cc",
       "desktop_capturer_differ_wrapper_unittest.cc",
       "desktop_frame_rotation_unittest.cc",
@@ -77,7 +78,6 @@ if (rtc_include_tests) {
       ":desktop_capture",
       ":desktop_capture_mock",
       ":primitives",
-      ":rgba_color",
       "../..:webrtc_common",
       "../../base:rtc_base_approved",
       "../../system_wrappers:system_wrappers",
@@ -99,29 +99,11 @@ if (rtc_include_tests) {
     }
   }
 
-  source_set("rgba_color") {
-    testonly = true
-
-    public_deps = [
-      ":desktop_capture",
-    ]
-
-    sources = [
-      "rgba_color.cc",
-      "rgba_color.h",
-    ]
-
-    deps = [
-      ":primitives",
-      "../..:webrtc_common",
-    ]
-  }
-
   source_set("screen_drawer") {
     testonly = true
 
     public_deps = [
-      ":rgba_color",
+      ":desktop_capture",
     ]
 
     sources = [
@@ -144,7 +126,6 @@ if (rtc_include_tests) {
 
     public_deps = [
       ":desktop_capture",
-      ":rgba_color",
       "//testing/gmock",
     ]
 
@@ -167,6 +148,8 @@ if (rtc_include_tests) {
 
 rtc_static_library("desktop_capture") {
   sources = [
+    "blank_detector_desktop_capturer_wrapper.cc",
+    "blank_detector_desktop_capturer_wrapper.h",
     "cropped_desktop_frame.cc",
     "cropped_desktop_frame.h",
     "cropping_window_capturer.cc",
@@ -205,6 +188,8 @@ rtc_static_library("desktop_capture") {
     "mouse_cursor_monitor_win.cc",
     "resolution_change_detector.cc",
     "resolution_change_detector.h",
+    "rgba_color.cc",
+    "rgba_color.h",
     "screen_capture_frame_queue.h",
     "screen_capturer_helper.cc",
     "screen_capturer_helper.h",