[Autofill] Add UMA timing metrics for requestAutocomplete dialog.

chrome/browser/android/tab_android.cc

Index: chrome/browser/android/tab_android.cc
diff --git a/chrome/browser/android/tab_android.cc b/chrome/browser/android/tab_android.cc
index 711f6cfa48b872dcf4f95769c529935966b7e780..e9fa111e9258a90e3c55c622186d4a56bdf70805 100644
--- a/chrome/browser/android/tab_android.cc
+++ b/chrome/browser/android/tab_android.cc
@@ -55,9 +55,10 @@ void BrowserTabContents::AttachTabHelpers(WebContents* contents) {
   // helpers may rely on that.
   SessionTabHelper::CreateForWebContents(contents);
 
-  TabAutofillManagerDelegate::CreateForWebContents(contents);
+  autofill::TabAutofillManagerDelegate::CreateForWebContents(contents);
   AutofillManager::CreateForWebContentsAndDelegate(
-      contents, TabAutofillManagerDelegate::FromWebContents(contents));
+      contents,
+      autofill::TabAutofillManagerDelegate::FromWebContents(contents));
   AutofillExternalDelegate::CreateForWebContentsAndManager(
       contents, AutofillManager::FromWebContents(contents));
   AutofillManager::FromWebContents(contents)->SetExternalDelegate(