Headless: Support sending and receiving of raw protocol messages

headless/lib/headless_devtools_client_browsertest.cc

Index: headless/lib/headless_devtools_client_browsertest.cc
diff --git a/headless/lib/headless_devtools_client_browsertest.cc b/headless/lib/headless_devtools_client_browsertest.cc
index bc67e65dbe4522fa15fd5c8d1ccdfbdcba786c0e..f524362808ead9ff8ad7809a3d9f42cc5ce947bf 100644
--- a/headless/lib/headless_devtools_client_browsertest.cc
+++ b/headless/lib/headless_devtools_client_browsertest.cc
@@ -987,4 +987,27 @@ class DevToolsHeaderStrippingTest : public HeadlessAsyncDevTooledBrowserTest,
 
 HEADLESS_ASYNC_DEVTOOLED_TEST_F(DevToolsHeaderStrippingTest);
 
+class RawDevtoolsProtocolTest
+    : public HeadlessAsyncDevTooledBrowserTest,
+      public HeadlessDevToolsClient::RawProtocolListener {
+ public:
+  void RunDevTooledTest() override {
+    devtools_client_->SetRawProtocolListener(this);
+    devtools_client_->SendRawDevtoolsMessage(
+        R"({"id": 1, "method": "Runtime.evaluate",
+            "params": {"expression": "1+1"}})");
+  }
+
+  void OnProtocolMessage(const std::string& json_message,
+                         const base::DictionaryValue* parsed_message) override {
+    EXPECT_EQ(
+        "{\"id\":1,\"result\":{\"result\":{\"type\":\"number\","
+        "\"value\":2,\"description\":\"2\"}}}",
+        json_message);
+    FinishAsynchronousTest();
+  }
+};
+
+HEADLESS_ASYNC_DEVTOOLED_TEST_F(RawDevtoolsProtocolTest);
+
 }  // namespace headless