Add --auto-open-devtools-for-tabs flag.

chrome/test/base/testing_browser_process.cc

Index: chrome/test/base/testing_browser_process.cc
diff --git a/chrome/test/base/testing_browser_process.cc b/chrome/test/base/testing_browser_process.cc
index 3f0d00640607362cd4925a810efa213ed37181d4..b52f0cc6d4f56148cdb768a9e2df65b0981736b9 100644
--- a/chrome/test/base/testing_browser_process.cc
+++ b/chrome/test/base/testing_browser_process.cc
@@ -258,9 +258,14 @@ message_center::MessageCenter* TestingBrowserProcess::message_center() {
 IntranetRedirectDetector* TestingBrowserProcess::intranet_redirect_detector() {
   return nullptr;
 }
+
 void TestingBrowserProcess::CreateDevToolsHttpProtocolHandler(
     const std::string& ip,
-    uint16_t port) {}
+    uint16_t port) {
+}
+
+void TestingBrowserProcess::CreateDevToolsAutoOpener() {
+}
 
 unsigned int TestingBrowserProcess::AddRefModule() {
   return ++module_ref_count_;