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

content/shell/browser/layout_test/layout_test_devtools_frontend.cc

Index: content/shell/browser/layout_test/layout_test_devtools_frontend.cc
diff --git a/content/shell/browser/layout_test/layout_test_devtools_frontend.cc b/content/shell/browser/layout_test/layout_test_devtools_frontend.cc
index c8941c616bfc799e4350cc95bd752c2dcb6ba6f0..a9c1af339010e2909ad51d86fd8ed8b32a2f96b5 100644
--- a/content/shell/browser/layout_test/layout_test_devtools_frontend.cc
+++ b/content/shell/browser/layout_test/layout_test_devtools_frontend.cc
@@ -33,15 +33,6 @@ LayoutTestDevToolsFrontend* LayoutTestDevToolsFrontend::Show(
   return devtools_frontend;
 }
 
-LayoutTestDevToolsFrontend::LayoutTestDevToolsFrontend(
-    Shell* frontend_shell,
-    DevToolsAgentHost* agent_host)
-    : ShellDevToolsFrontend(frontend_shell, agent_host) {
-}
-
-LayoutTestDevToolsFrontend::~LayoutTestDevToolsFrontend() {
-}
-
 // static.
 GURL LayoutTestDevToolsFrontend::GetDevToolsPathAsURL(
     const std::string& settings,
@@ -70,6 +61,27 @@ GURL LayoutTestDevToolsFrontend::GetDevToolsPathAsURL(
   return result;
 }
 
+void LayoutTestDevToolsFrontend::ReuseFrontend(WebContents* inspected_contents,
+                                               const std::string& settings,
+                                               const std::string frontend_url) {
+  AttachTo(inspected_contents);
+  frontend_shell()->LoadURL(GetDevToolsPathAsURL(settings, frontend_url));
+}
+
+LayoutTestDevToolsFrontend::LayoutTestDevToolsFrontend(
+    Shell* frontend_shell,
+    DevToolsAgentHost* agent_host)
+    : ShellDevToolsFrontend(frontend_shell, agent_host) {
+}
+
+LayoutTestDevToolsFrontend::~LayoutTestDevToolsFrontend() {
+}
+
+void LayoutTestDevToolsFrontend::AgentHostClosed(
+    DevToolsAgentHost* agent_host, bool replaced) {
+  // Do not close the front-end shell.
+}
+
 void LayoutTestDevToolsFrontend::RenderProcessGone(
     base::TerminationStatus status) {
   WebKitTestController::Get()->DevToolsProcessCrashed();