diff -rupN angle-8613f49/src/libGLESv2/libGLESv2_mingw32.def angle-8613f49-new/src/libGLESv2/libGLESv2_mingw32.def
--- angle-8613f49/src/libGLESv2/libGLESv2_mingw32.def	2017-06-30 15:34:05.000000000 +0200
+++ angle-8613f49-new/src/libGLESv2/libGLESv2_mingw32.def	2017-06-30 15:39:50.028811427 +0200
@@ -313,4 +313,14 @@ EXPORTS
     ANGLEPlatformCurrent@0            @290
     ANGLEPlatformInitialize@4         @291
     ANGLEPlatformShutdown@0           @292
-    
\ No newline at end of file
+
+    ; Needed by Webkit
+    _Z9ShCompilePvPKPKcji                    @400
+    _Z19ShConstructCompilerj12ShShaderSpec14ShShaderOutputPK18ShBuiltInResources    @401
+    _Z10ShDestructPv                         @402
+    _Z15ShGetAttributesPv                    @403
+    _Z12ShGetInfoLogB5cxx11Pv                @404
+    _Z15ShGetObjectCodeB5cxx11Pv             @405
+    _Z13ShGetUniformsPv                      @406
+    _Z22ShInitBuiltInResourcesP18ShBuiltInResources     @407
+    _Z12ShInitializev                        @408
diff -rupN angle-8613f49/src/libGLESv2/libGLESv2_mingw64.def angle-8613f49-new/src/libGLESv2/libGLESv2_mingw64.def
--- angle-8613f49/src/libGLESv2/libGLESv2_mingw64.def	2017-06-30 15:40:53.545736980 +0200
+++ angle-8613f49-new/src/libGLESv2/libGLESv2_mingw64.def	2017-06-30 15:40:52.176738572 +0200
@@ -313,3 +313,14 @@ EXPORTS
     ANGLEPlatformCurrent            @290
     ANGLEPlatformInitialize         @291
     ANGLEPlatformShutdown           @292
+
+    ; Needed by Webkit
+    _Z9ShCompilePvPKPKcyi                    @400
+    _Z19ShConstructCompilerj12ShShaderSpec14ShShaderOutputPK18ShBuiltInResources    @401
+    _Z10ShDestructPv                         @402
+    _Z15ShGetAttributesPv                    @403
+    _Z12ShGetInfoLogB5cxx11Pv                @404
+    _Z15ShGetObjectCodeB5cxx11Pv             @405
+    _Z13ShGetUniformsPv                      @406
+    _Z22ShInitBuiltInResourcesP18ShBuiltInResources     @407
+    _Z12ShInitializev                        @408