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

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 703b0843afde275174ef6ad133baf3297a90d9b0..b15f6b8d869f91bbabd5f041047162f8d12036be 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -113,6 +113,12 @@ const char kAuthServerWhitelist[]           = "auth-server-whitelist";
 const char kAutoSelectDesktopCaptureSource[] =
     "auto-select-desktop-capture-source";
 
+// This flag makes Chrome auto-open DevTools window for each tab. It is
+// intended to be used by developers and automation to not require user
+// interaction for opening DevTools.
+const char kAutoOpenDevToolsForTabs[] =
+    "auto-open-devtools-for-tabs";

[pfeldman, 2016/02/12 02:15:08]

ditto

+
 // This flag causes the user engagement checks for showing app banners to be
 // bypassed. It is intended to be used by developers who wish to test that their
 // sites otherwise meet the criteria needed to show app banners.