DevTools: add initial support for shared workers debugging

content/browser/debugger/devtools_window.cc

Index: content/browser/debugger/devtools_window.cc
diff --git a/content/browser/debugger/devtools_window.cc b/content/browser/debugger/devtools_window.cc
index 1b3ad5e19f1c38ddacad39a9b72df677a7c137d4..e789c1e8c20d179c3ed1155ba2427769af49b28b 100644
--- a/content/browser/debugger/devtools_window.cc
+++ b/content/browser/debugger/devtools_window.cc
@@ -95,9 +95,12 @@ DevToolsWindow::DevToolsWindow(Profile* profile,
       this,
       NotificationType::BROWSER_THEME_CHANGED,
       Source<ThemeService>(ThemeServiceFactory::GetForProfile(profile_)));
-  TabContents* tab = inspected_rvh->delegate()->GetAsTabContents();
-  if (tab)
-    inspected_tab_ = TabContentsWrapper::GetCurrentWrapperForContents(tab);
+  // There is now inspected_rvh in case of shared workers.
+  if (inspected_rvh) {
+    TabContents* tab = inspected_rvh->delegate()->GetAsTabContents();
+    if (tab)
+      inspected_tab_ = TabContentsWrapper::GetCurrentWrapperForContents(tab);
+  }
 }
 
 DevToolsWindow::~DevToolsWindow() {