Added isCancelled() flag to ProcessOutput

platform/platform-api/src/com/intellij/execution/process/CapturingProcessHandler.java

@@ -115,6 +115,7 @@ public class CapturingProcessHandler extends OSProcessHandler {
         if (!isProcessTerminating() && !isProcessTerminated()) {
           destroyProcess();
         }
+        myOutput.setCancelled();
         break;
       }
     }

platform/platform-api/src/com/intellij/execution/process/ProcessOutput.java

@@ -29,6 +29,7 @@ public class ProcessOutput {
   private final StringBuilder myStderrBuilder = new StringBuilder();
   private int myExitCode;
   private boolean myTimeout;
+  private boolean myCancelled;
 
   public ProcessOutput() {
     myExitCode = -1; // until set explicitly, exit code denotes an error.
@@ -96,4 +97,12 @@ public class ProcessOutput {
     }
     return true;
   }
+
+  public boolean isCancelled() {
+    return myCancelled;
+  }
+
+  public void setCancelled() {
+    myCancelled = true;
+  }
 }