Fix broken mac/fuchsia compiles (flutter#19339)

Author: arbreng

shell/platform/darwin/ios/framework/Source/FlutterPlatformViews_Internal.h

@@ -14,6 +14,7 @@
 #include "flutter/shell/platform/darwin/ios/framework/Headers/FlutterPlatformViews.h"
 #include "flutter/shell/platform/darwin/ios/framework/Headers/FlutterPlugin.h"
 #include "flutter/shell/platform/darwin/ios/ios_context.h"
+#include "third_party/skia/include/core/SkPictureRecorder.h"
 
 // A UIView that is used as the parent for embedded UIViews.
 //

shell/platform/fuchsia/flutter/platform_view_unittest.cc

@@ -7,6 +7,7 @@
 #include <gtest/gtest.h>
 #include <lib/async-loop/cpp/loop.h>
 #include <lib/async-loop/default.h>
+#include <lib/async/default.h>
 #include <lib/fidl/cpp/binding_set.h>
 #include <lib/fidl/cpp/interface_request.h>
 #include <lib/sys/cpp/testing/service_directory_provider.h>