Add compiler proguard rule for keeping ProgressManager used in webdemo

(cherry picked from commit 5284db8)

compiler/compiler.pro

diff --git a/compiler/compiler.pro b/compiler/compiler.pro
index 169717a..0a4dd22 100644
--- a/compiler/compiler.pro
+++ b/compiler/compiler.pro
@@ -216,4 +216,9 @@
 -keep class com.sun.source.** { *; }
 
 # for coroutines
--keep class kotlinx.coroutines.** { *; }
\ No newline at end of file
+-keep class kotlinx.coroutines.** { *; }
+
+# for webdemo
+-keep class com.intellij.openapi.progress.ProgressManager { *; }
+
+        
\ No newline at end of file