Implement the target locator commands for ChromeDriver.

chrome/browser/automation/testing_automation_provider.cc

Index: chrome/browser/automation/testing_automation_provider.cc
diff --git a/chrome/browser/automation/testing_automation_provider.cc b/chrome/browser/automation/testing_automation_provider.cc
index 6e718cb79e487ceefef9784813f3102762a6a47b..693eaa78e00f0e08618e961c5aa30cce1e23e50c 100644
--- a/chrome/browser/automation/testing_automation_provider.cc
+++ b/chrome/browser/automation/testing_automation_provider.cc
@@ -398,6 +398,8 @@ bool TestingAutomationProvider::OnMessageReceived(
     IPC_MESSAGE_HANDLER_DELAY_REPLY(
         AutomationMsg_WaitForProcessLauncherThreadToGoIdle,
         WaitForProcessLauncherThreadToGoIdle)
+    IPC_MESSAGE_HANDLER(AutomationMsg_GetParentBrowserOfTab,
+                        GetParentBrowserOfTab)
 
     IPC_MESSAGE_UNHANDLED(
         handled = AutomationProvider::OnMessageReceived(message))
@@ -4616,6 +4618,18 @@ void TestingAutomationProvider::WaitForProcessLauncherThreadToGoIdle(
   new WaitForProcessLauncherThreadToGoIdleObserver(this, reply_message);
 }
 
+void TestingAutomationProvider::GetParentBrowserOfTab(int tab_handle,
+                                                      int* browser_handle) {
+  *browser_handle = 0;
+  if (tab_tracker_->ContainsHandle(tab_handle)) {
+    NavigationController* controller = tab_tracker_->GetResource(tab_handle);
+    int index;
+    Browser* browser = Browser::GetBrowserForController(controller, &index);
+    if (browser)
+      *browser_handle = browser_tracker_->Add(browser);
+  }
+}
+
 // TODO(brettw) change this to accept GURLs when history supports it
 void TestingAutomationProvider::OnRedirectQueryComplete(
     HistoryService::Handle request_handle,