Re-submit of https://codereview.chromium.org/356613002

chrome/browser/extensions/api/gcd_private/gcd_private_apitest.cc

Index: chrome/browser/extensions/api/gcd_private/gcd_private_apitest.cc
diff --git a/chrome/browser/extensions/api/gcd_private/gcd_private_apitest.cc b/chrome/browser/extensions/api/gcd_private/gcd_private_apitest.cc
index 193a498c686c814297bf72a4f863e5a0c75b262a..bd502da2b7ed4336abd3b254b28d5f1595b3ffef 100644
--- a/chrome/browser/extensions/api/gcd_private/gcd_private_apitest.cc
+++ b/chrome/browser/extensions/api/gcd_private/gcd_private_apitest.cc
@@ -130,6 +130,22 @@ const uint8 kGoodbyePacket[] = {
     'o',  'c',  'a',  'l',  0x00,
 };
 
+const uint8 kQueryPacket[] = {
+    // Header
+    0x00, 0x00,  // ID is zeroed out
+    0x00, 0x00,  // No flags.
+    0x00, 0x01,  // One question.
+    0x00, 0x00,  // 0 RRs (answers)
+    0x00, 0x00,  // 0 authority RRs
+    0x00, 0x00,  // 0 additional RRs
+
+    // Question
+    // This part is echoed back from the respective query.
+    0x07, '_',  'p', 'r', 'i', 'v', 'e', 't',  0x04, '_',  't', 'c',
+    'p',  0x05, 'l', 'o', 'c', 'a', 'l', 0x00, 0x00, 0x0c,  // TYPE is PTR.
+    0x00, 0x01,                                             // CLASS is IN.
+};
+
 #endif  // ENABLE_MDNS
 
 // Sentinel value to signify the request should fail.
@@ -254,6 +270,18 @@ IN_PROC_BROWSER_TEST_F(GcdPrivateAPITest, AddRemove) {
   EXPECT_TRUE(RunExtensionSubtest("gcd_private/api", "remove_device.html"));
 }
 
+IN_PROC_BROWSER_TEST_F(GcdPrivateAPITest, SendQuery) {
+// TODO(noamsml): Win Dbg has a workaround that makes RunExtensionSubtest
+// always return true without actually running the test. Remove when fixed.
+// See http://crbug.com/177163 for details.
+#if !defined(OS_WIN) || defined(NDEBUG)
+  EXPECT_CALL(*test_service_discovery_client_,
+              OnSendTo(std::string(reinterpret_cast<const char*>(kQueryPacket),
+                                   sizeof(kQueryPacket)))).Times(2);
+#endif
+  EXPECT_TRUE(RunExtensionSubtest("gcd_private/api", "send_query.html"));
+}
+
 #endif  // ENABLE_MDNS
 
 }  // namespace