Add methods to allow resuming execution after calling TerminateExecution().

test/cctest/test-thread-termination.cc

Index: test/cctest/test-thread-termination.cc
===================================================================
--- test/cctest/test-thread-termination.cc	(revision 12718)
+++ test/cctest/test-thread-termination.cc	(working copy)
@@ -373,3 +373,41 @@
   context.Dispose();
 }
 
+v8::Handle<v8::Value> DoLoopResume(const v8::Arguments& args) {
+  v8::TryCatch try_catch;
+  CHECK(!v8::V8::IsExecutionTerminating());
+  v8::Script::Compile(v8::String::New("var term = true;"
+                                      "while(true) {"
+                                      "  if (term) terminate();"
+                                      "  term = false;"
+                                      "}"))->Run();
+  CHECK(try_catch.HasCaught());
+  CHECK(try_catch.Exception()->IsNull());
+  CHECK(try_catch.Message().IsEmpty());
+  CHECK(!try_catch.CanContinue());
+  CHECK(v8::V8::IsExecutionTerminating());
+  CHECK(try_catch.HasTerminated());
+  v8::V8::ResumeExecution();
+  CHECK(!v8::V8::IsExecutionTerminating());
+  return v8::Undefined();
+}
+
+// Test that a single thread of JavaScript execution can terminate
+// itself and then resume execution.
+TEST(TerminateResumeFromThreadItself) {
+  v8::HandleScope scope;
+  v8::Handle<v8::ObjectTemplate> global =
+      CreateGlobalTemplate(TerminateCurrentThread, DoLoopResume);
+  v8::Persistent<v8::Context> context = v8::Context::New(NULL, global);
+  v8::Context::Scope context_scope(context);
+  CHECK(!v8::V8::IsExecutionTerminating());
+  // Run a loop that will be infinite if thread termination does not work.
+  v8::Handle<v8::String> source =
+      v8::String::New("try { doloop(); } catch(e) { fail(); }");
+  v8::Script::Compile(source)->Run();
+  // Test that we can run the code again after thread termination.
+  CHECK(!v8::V8::IsExecutionTerminating());
+  v8::Script::Compile(source)->Run();
+  context.Dispose();
+}
+