Implement the target locator commands for ChromeDriver.

chrome/test/automation/tab_proxy.cc

Index: chrome/test/automation/tab_proxy.cc
diff --git a/chrome/test/automation/tab_proxy.cc b/chrome/test/automation/tab_proxy.cc
index e04c039ba13fb10c8c826665b785068e11e3aa0c..20444a00ae01337e350e96724225cbe37f72dffb 100644
--- a/chrome/test/automation/tab_proxy.cc
+++ b/chrome/test/automation/tab_proxy.cc
@@ -13,6 +13,7 @@
 #include "chrome/common/automation_messages.h"
 #include "chrome/common/json_value_serializer.h"
 #include "chrome/test/automation/automation_proxy.h"
+#include "chrome/test/automation/browser_proxy.h"
 #include "googleurl/src/gurl.h"
 
 TabProxy::TabProxy(AutomationMessageSender* sender,
@@ -21,6 +22,28 @@ TabProxy::TabProxy(AutomationMessageSender* sender,
     : AutomationResourceProxy(tracker, sender, handle) {
 }
 
+scoped_refptr<BrowserProxy> TabProxy::GetParentBrowser() const {
+  if (!is_valid())
+    return NULL;
+
+  int browser_handle = 0;
+  sender_->Send(
+      new AutomationMsg_GetParentBrowserOfTab(handle_, &browser_handle));
+  if (!browser_handle)
+    return NULL;
+
+  BrowserProxy* browser = static_cast<BrowserProxy*>(
+      tracker_->GetResource(browser_handle));
+  if (!browser) {
+    browser = new BrowserProxy(sender_, tracker_, browser_handle);
+    browser->AddRef();
+  }
+
+  // Since there is no scoped_refptr::attach.
+  scoped_refptr<BrowserProxy> result;
+  result.swap(&browser);
+  return result;
+}
 
 bool TabProxy::GetTabTitle(std::wstring* title) const {
   if (!is_valid())