Add some closureised JS bindings for DevTools for use by headless embedder

headless/test/headless_js_bindings_browsertest.cc

Index: headless/test/headless_js_bindings_browsertest.cc
diff --git a/headless/test/headless_js_bindings_browsertest.cc b/headless/test/headless_js_bindings_browsertest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..7b9fad5fb42402f93a397a3a4ce5b924888ae125
--- /dev/null
+++ b/headless/test/headless_js_bindings_browsertest.cc
@@ -0,0 +1,160 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "base/base64.h"
+#include "base/json/json_reader.h"
+#include "base/path_service.h"
+#include "base/threading/thread_restrictions.h"
+#include "content/public/test/browser_test.h"
+#include "headless/grit/headless_browsertest_resources.h"
+#include "headless/public/devtools/domains/runtime.h"
+#include "headless/public/headless_browser.h"
+#include "headless/public/headless_devtools_client.h"
+#include "headless/public/headless_tab_socket.h"
+#include "headless/public/headless_web_contents.h"
+#include "headless/test/headless_browser_test.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/base/resource/resource_bundle.h"
+
+namespace headless {
+
+class HeadlessJsBindingsTest
+    : public HeadlessAsyncDevTooledBrowserTest,
+      public HeadlessTabSocket::Listener,
+      public HeadlessDevToolsClient::RawProtocolListener {
+ public:
+  void SetUp() override {
+    options()->mojo_service_names.insert("headless::TabSocket");
+    HeadlessAsyncDevTooledBrowserTest::SetUp();
+  }
+
+  void SetUpOnMainThread() override {
+    base::ThreadRestrictions::SetIOAllowed(true);
+    base::FilePath pak_path;
+    ASSERT_TRUE(PathService::Get(base::DIR_MODULE, &pak_path));
+    pak_path = pak_path.AppendASCII("headless_browser_tests.pak");
+    ResourceBundle::GetSharedInstance().AddDataPackFromPath(
+        pak_path, ui::SCALE_FACTOR_NONE);
+  }
+
+  void RunDevTooledTest() override {
+    headless_tab_socket_ = web_contents_->GetHeadlessTabSocket();
+    DCHECK(headless_tab_socket_);
+    headless_tab_socket_->SetListener(this);
+    devtools_client_->SetRawProtocolListener(this);
+    devtools_client_->GetRuntime()->Evaluate(
+        ResourceBundle::GetSharedInstance()
+            .GetRawDataResource(DEVTOOLS_BINDINGS_TEST)
+            .as_string(),
+        base::Bind(&HeadlessJsBindingsTest::FailOnJsEvaluateException,
+                   base::Unretained(this)));
+    RunJsBindingsTest();
+  }
+
+  virtual void RunJsBindingsTest() = 0;
+  virtual std::string GetExpectedResult() = 0;
+
+  void FailOnJsEvaluateException(
+      std::unique_ptr<runtime::EvaluateResult> result) {
+    if (!result->HasExceptionDetails())
+      return;
+
+    FinishAsynchronousTest();
+
+    const runtime::ExceptionDetails* exception_details =
+        result->GetExceptionDetails();
+    FAIL() << exception_details->GetText()
+           << (exception_details->HasException()
+                   ? exception_details->GetException()->GetDescription().c_str()
+                   : "");
+  }
+
+  void OnMessageFromTab(const std::string& json_message) override {
+    std::unique_ptr<base::Value> message =
+        base::JSONReader::Read(json_message, base::JSON_PARSE_RFC);
+    const base::DictionaryValue* message_dict;
+    const base::DictionaryValue* params_dict;
+    std::string method;
+    int id;
+    if (!message || !message->GetAsDictionary(&message_dict) ||
+        !message_dict->GetString("method", &method) ||
+        !message_dict->GetDictionary("params", &params_dict) ||
+        !message_dict->GetInteger("id", &id)) {
+      FinishAsynchronousTest();
+      FAIL() << "Badly formed message " << json_message;
+      return;
+    }
+
+    if (method == "__Result") {
+      std::string result;
+      params_dict->GetString("result", &result);
+      EXPECT_EQ(GetExpectedResult(), result);
+      FinishAsynchronousTest();
+      return;
+    }
+
+    devtools_client_->SendRawDevToolsMessage(json_message);
+  }
+
+  HeadlessWebContents::Builder::TabSocketType GetTabSocketType() override {
+    return HeadlessWebContents::Builder::TabSocketType::MAIN_WORLD;
+  }
+
+  bool OnProtocolMessage(const std::string& devtools_agent_host_id,
+                         const std::string& json_message,
+                         const base::DictionaryValue& parsed_message) override {
+    int id;
+    // If |parsed_message| contains an id we know this is a message reply.
+    if (parsed_message.GetInteger("id", &id)) {
+      // We are only interested in message replies (ones with an id) where the
+      // id is odd. The reason is HeadlessDevToolsClientImpl uses even/oddness
+      // to distinguish between commands send from the C++ bindings and those
+      // via HeadlessDevToolsClientImpl::SendRawDevToolsMessage.
+      if ((id % 2) == 0)
+        return false;
+    }
+
+    headless_tab_socket_->SendMessageToTab(json_message);
+    return true;
+  }
+
+ private:
+  HeadlessTabSocket* headless_tab_socket_;
+};
+
+class SimpleCommandJsBindingsTest : public HeadlessJsBindingsTest {
+ public:
+  void RunJsBindingsTest() override {
+    devtools_client_->GetRuntime()->Evaluate(
+        "new chromium.BindingsTest().evalOneAddOne();",
+        base::Bind(&HeadlessJsBindingsTest::FailOnJsEvaluateException,
+                   base::Unretained(this)));
+  }
+
+  std::string GetExpectedResult() override { return "2"; }
+};
+
+HEADLESS_ASYNC_DEVTOOLED_TEST_F(SimpleCommandJsBindingsTest);
+
+class SimpleEventJsBindingsTest : public HeadlessJsBindingsTest {
+ public:
+  void RunJsBindingsTest() override {
+    devtools_client_->GetRuntime()->Evaluate(
+        "new chromium.BindingsTest().listenForChildNodeCountUpdated();",
+        base::Bind(&HeadlessJsBindingsTest::FailOnJsEvaluateException,
+                   base::Unretained(this)));
+  }
+
+  std::string GetExpectedResult() override {
+    return "{\"nodeId\":4,\"childNodeCount\":1}";
+  }
+};
+
+HEADLESS_ASYNC_DEVTOOLED_TEST_F(SimpleEventJsBindingsTest);
+}  // namespace headless