Add DesktopFrame rotation functions

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 b43d90513455a3f71dd3ffd85e71047de4083bb4..91c9d8b2e7a6b5e3b5a545e117831c79b8463313 100644
--- a/webrtc/modules/desktop_capture/BUILD.gn
+++ b/webrtc/modules/desktop_capture/BUILD.gn
@@ -21,6 +21,8 @@ rtc_static_library("primitives") {
     "desktop_geometry.h",
     "desktop_region.cc",
     "desktop_region.h",
+    "rgba_color.cc",
+    "rgba_color.h",
     "shared_desktop_frame.cc",
     "shared_desktop_frame.h",
   ]
@@ -31,24 +33,11 @@ rtc_static_library("primitives") {
 }
 
 if (rtc_include_tests) {
-  source_set("rgba_color") {
-    testonly = true
-
-    public_deps = [
-      ":desktop_capture",
-    ]
-
-    sources = [
-      "rgba_color.cc",
-      "rgba_color.h",
-    ]
-  }
-
   source_set("screen_drawer") {
     testonly = true
 
     public_deps = [
-      ":rgba_color",
+      ":primitives",
     ]
 
     sources = [
@@ -65,7 +54,7 @@ if (rtc_include_tests) {
 
     public_deps = [
       ":desktop_capture",
-      ":rgba_color",
+      ":primitives",
       "//testing/gmock",
     ]
 
@@ -94,6 +83,8 @@ rtc_static_library("desktop_capture") {
     "desktop_capture_options.h",
     "desktop_capturer.cc",
     "desktop_capturer.h",
+    "desktop_frame_rotator.cc",
+    "desktop_frame_rotator.h",
     "desktop_frame_win.cc",
     "desktop_frame_win.h",
     "mac/desktop_configuration.h",