[Autofill] Add UMA timing metrics for requestAutocomplete dialog.

chrome/browser/autofill/autocheckout_manager.h

Index: chrome/browser/autofill/autocheckout_manager.h
diff --git a/chrome/browser/autofill/autocheckout_manager.h b/chrome/browser/autofill/autocheckout_manager.h
index 9e0b7ebc0581f0623e6800076db3473b0e7abe99..85f928ac17e4b280872d2e19ad4f887588a87683 100644
--- a/chrome/browser/autofill/autocheckout_manager.h
+++ b/chrome/browser/autofill/autocheckout_manager.h
@@ -21,21 +21,20 @@ class GURL;
 struct FormData;
 struct FormFieldData;
 
-namespace autofill {
-struct WebElementDescriptor;
-}
-
 namespace content {
 struct SSLStatus;
 }
 
+namespace autofill {
+
+struct WebElementDescriptor;
+
 class AutocheckoutManager {
  public:
   explicit AutocheckoutManager(AutofillManager* autofill_manager);
 
   // Sets proceed element to use when filling forms on the current page.
-  void SetProceedElementDescriptor(
-    const autofill::WebElementDescriptor& proceed);
+  void SetProceedElementDescriptor(const WebElementDescriptor& proceed);
 
   // Fill all the forms seen by the Autofill manager with the information
   // gathered from the requestAutocomplete dialog.
@@ -68,11 +67,13 @@ class AutocheckoutManager {
 
   // Descriptor of the web element to click in order to proceed in the
   // Autocheckout flow.
-  scoped_ptr<autofill::WebElementDescriptor> proceed_descriptor_;
+  scoped_ptr<WebElementDescriptor> proceed_descriptor_;
 
   base::WeakPtrFactory<AutocheckoutManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AutocheckoutManager);
 };
 
+}  // namespace autofill
+
 #endif  // CHROME_BROWSER_AUTOFILL_AUTOCHECKOUT_MANAGER_H_