Revert of [debugger] deprecate v8::Debug:GetDebugContext.

test/cctest/test-debug.cc

Index: test/cctest/test-debug.cc
diff --git a/test/cctest/test-debug.cc b/test/cctest/test-debug.cc
index f50cac5989e0a83b4907925fa0eabf84c4f2f28a..5af65cb1082e52a1e21c630d39d764084d2b22eb 100644
--- a/test/cctest/test-debug.cc
+++ b/test/cctest/test-debug.cc
@@ -5662,6 +5662,27 @@
   CheckDebuggerUnloaded(isolate);
 }
 
+
+TEST(DebugContextIsPreservedBetweenAccesses) {
+  v8::HandleScope scope(CcTest::isolate());
+  v8::Debug::SetDebugEventListener(CcTest::isolate(),
+                                   DebugEventBreakPointHitCount);
+  v8::Local<v8::Context> context1 =
+      v8::Debug::GetDebugContext(CcTest::isolate());
+  v8::Local<v8::Context> context2 =
+      v8::Debug::GetDebugContext(CcTest::isolate());
+  CHECK(v8::Utils::OpenHandle(*context1).is_identical_to(
+            v8::Utils::OpenHandle(*context2)));
+  v8::Debug::SetDebugEventListener(CcTest::isolate(), nullptr);
+}
+
+
+TEST(NoDebugContextWhenDebuggerDisabled) {
+  v8::HandleScope scope(CcTest::isolate());
+  v8::Local<v8::Context> context =
+      v8::Debug::GetDebugContext(CcTest::isolate());
+  CHECK(context.IsEmpty());
+}
 
 static v8::Local<v8::Value> expected_callback_data;
 static void DebugEventContextChecker(const v8::Debug::EventDetails& details) {