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

chrome/browser/devtools/chrome_devtools_discovery_provider.cc

Index: chrome/browser/devtools/chrome_devtools_discovery_provider.cc
diff --git a/chrome/browser/devtools/chrome_devtools_discovery_provider.cc b/chrome/browser/devtools/chrome_devtools_discovery_provider.cc
index 761c2b4c20e97f35f43dfa4a424314b51dab163e..c3626e92645f936c95ee757d0f564224f3e1d4f4 100644
--- a/chrome/browser/devtools/chrome_devtools_discovery_provider.cc
+++ b/chrome/browser/devtools/chrome_devtools_discovery_provider.cc
@@ -4,10 +4,13 @@
 
 #include "chrome/browser/devtools/chrome_devtools_discovery_provider.h"
 
+#include "base/command_line.h"
 #include "chrome/browser/devtools/devtools_target_impl.h"
+#include "chrome/browser/devtools/devtools_window.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/browser_navigator.h"
 #include "chrome/browser/ui/browser_navigator_params.h"
+#include "chrome/common/chrome_switches.h"
 
 namespace {
 
@@ -24,12 +27,25 @@ CreateNewChromeTab(const GURL& url) {
 
 }  // namespace
 
-ChromeDevToolsDiscoveryProvider::ChromeDevToolsDiscoveryProvider() {
+ChromeDevToolsDiscoveryProvider::ChromeDevToolsDiscoveryProvider()
+    : browser_tab_strip_tracker_(this, nullptr, nullptr) {
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(

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

How does this make sense here?

+      switches::kAutoOpenDevToolsForTabs)) {
+    browser_tab_strip_tracker_.Init(
+        BrowserTabStripTracker::InitWith::ALL_BROWERS);
+  }
 }
 
 ChromeDevToolsDiscoveryProvider::~ChromeDevToolsDiscoveryProvider() {
 }
 
+void ChromeDevToolsDiscoveryProvider::TabInsertedAt(
+    content::WebContents* contents,
+    int index,
+    bool foreground) {
+  DevToolsWindow::OpenDevToolsWindow(contents);
+}
+
 devtools_discovery::DevToolsTargetDescriptor::List
 ChromeDevToolsDiscoveryProvider::GetDescriptors() {
   std::vector<DevToolsTargetImpl*> list = DevToolsTargetImpl::EnumerateAll();