Test runner: make inspector tests reuse a single inspector process.

content/shell/browser/webkit_test_controller.h

Index: content/shell/browser/webkit_test_controller.h
diff --git a/content/shell/browser/webkit_test_controller.h b/content/shell/browser/webkit_test_controller.h
index 0bbe9957d54a18a8f961939a1a3f3b34f49d3afc..8b760993198d4c41aafa54c7c17a9799a9159fc3 100644
--- a/content/shell/browser/webkit_test_controller.h
+++ b/content/shell/browser/webkit_test_controller.h
@@ -29,6 +29,7 @@ class SkBitmap;
 namespace content {
 
 class Shell;
+class ShellDevToolsFrontend;
 
 #if defined(OS_ANDROID)
 // Android uses a nested message loop for running layout tests because the
@@ -214,6 +215,8 @@ class WebKitTestController : public base::NonThreadSafe,
   const bool is_leak_detection_enabled_;
   bool crash_when_leak_found_;
 
+  ShellDevToolsFrontend* devtools_frontend_;
+
 #if defined(OS_ANDROID)
   // Because of the nested message pump implementation, Android needs to allow
   // waiting on the UI thread while layout tests are being ran.