Add Network.setSendRequestIdHeader and use it in headless

headless/test/headless_browser_test.cc

Index: headless/test/headless_browser_test.cc
diff --git a/headless/test/headless_browser_test.cc b/headless/test/headless_browser_test.cc
index 53e2db2ba0f633d3ab9ab05ec3acbb8a667ef560..fcf866f715b253a4c7edc8a598c761539c1526eb 100644
--- a/headless/test/headless_browser_test.cc
+++ b/headless/test/headless_browser_test.cc
@@ -209,7 +209,10 @@ void HeadlessAsyncDevTooledBrowserTest::RenderProcessExited(
 }
 
 void HeadlessAsyncDevTooledBrowserTest::RunTest() {
-  browser_context_ = browser()->CreateBrowserContextBuilder().Build();
+  browser_context_ = browser()
+                         ->CreateBrowserContextBuilder()
+                         .SetProtocolHandlers(GetProtocolHandlers())
+                         .Build();
   browser()->SetDefaultBrowserContext(browser_context_);
 
   web_contents_ = browser_context_->CreateWebContentsBuilder().Build();
@@ -226,4 +229,8 @@ void HeadlessAsyncDevTooledBrowserTest::RunTest() {
   browser_context_ = nullptr;
 }
 
+ProtocolHandlerMap HeadlessAsyncDevTooledBrowserTest::GetProtocolHandlers() {
+  return ProtocolHandlerMap();
+}
+
 }  // namespace headless