[macos] windows & macos should share same cpp code base

example/macos/Podfile.lock

@@ -15,7 +15,7 @@ EXTERNAL SOURCES:
 
 SPEC CHECKSUMS:
   FlutterMacOS: ae6af50a8ea7d6103d888583d46bd8328a7e9811
-  webview_cef: 1c58878c88cb921c6060d6df87d9fe26990a16a2
+  webview_cef: 60cb104c4f5d7454500fa260cfbaeb1da3d45292
 
 PODFILE CHECKSUM: 6eac6b3292e5142cfc23bdeb71848a40ec51c14c
 

lib/src/webview.dart

@@ -161,6 +161,9 @@ class WebviewState extends State<Webview> {
                   -signal.scrollDelta.dy.round());
             }
           },
+          onPointerPanZoomUpdate: (event) {
+            print(event.panDelta);
+          },
           child: Texture(textureId: _controller._textureId),
         )));
   }

macos/Classes/CefWrapper.mm

@@ -9,7 +9,8 @@
 #import <Foundation/Foundation.h>
 #import "include/wrapper/cef_library_loader.h"
 #import "include/cef_app.h"
-#import "simple_app.h"
+#import "../../common/simple_app.h"
+#import "../../common/simple_handler.h"
 
 #include <thread>
 

macos/Classes/cef_bridge.cc

@@ -0,0 +1,8 @@
+// Relative import to be able to reuse the C sources.
+#ifndef CefBridge_h
+#define CefBridge_h
+
+#include "../../common/simple_app.cc"
+#include "../../common/simple_handler.cc"
+
+#endif

macos/webview_cef.podspec

@@ -22,7 +22,7 @@ Flutter webview backed by CEF (Chromium Embedded Framework)
   $dir = File.dirname(__FILE__)
   $dir = $dir + "/third/cef/**"
   s.xcconfig = { "HEADER_SEARCH_PATHS" => $dir}
-  s.private_header_files = 'Classes/simple_app.h', 'Classes/simple_handler.h'
+  # s.private_header_files = '../common/simple_app.h', '../common/simple_handler.h'
 
   s.platform = :osx, '10.11'
   s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES' }