[Autofill Views] Adding 2-line dropdown display experiment

Adds the new two line suggestion display experiment argument for
credit card and profile autofill drop downs. This new experiment
argument will allow autofill drop downs to show two lines worth of
information for autofill suggestions as well as a leading icon
for the given suggestion (if any).

Bug: 870342
Change-Id: Iaa303bafea5fe09f81538d452e2f6871c0d4282a

Screenshots (Googlers-only): https://drive.google.com/drive/folders/1XDzDE9GiOt4bAG_kDXZDaiJbbBvuTwPX?usp=sharing

Change-Id: Iaa303bafea5fe09f81538d452e2f6871c0d4282a
Reviewed-on: https://chromium-review.googlesource.com/1234968
Commit-Queue: Tien Mai <[email protected]>
Reviewed-by: Vasilii Sukhanov <[email protected]>
Reviewed-by: Tommy Martino <[email protected]>
Reviewed-by: Fabio Tirelo <[email protected]>
Cr-Commit-Position: refs/heads/master@{#593569}
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 66472af..da66fbab 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -1303,12 +1303,17 @@
 const FeatureEntry::FeatureParam kAutofillDropdownLayoutTrailingIcon[] = {
     {autofill::kAutofillDropdownLayoutParameterName,
      autofill::kAutofillDropdownLayoutParameterTrailingIcon}};
+const FeatureEntry::FeatureParam kAutofillDropdownLayoutTwoLinesLeadingIcon[] =
+    {{autofill::kAutofillDropdownLayoutParameterName,
+      autofill::kAutofillDropdownLayoutParameterTwoLinesLeadingIcon}};
 
 const FeatureEntry::FeatureVariation kAutofillDropdownLayoutVariations[] = {
     {"(leading icon)", kAutofillDropdownLayoutLeadingIcon,
      base::size(kAutofillDropdownLayoutLeadingIcon), nullptr},
     {"(trailing icon)", kAutofillDropdownLayoutTrailingIcon,
-     base::size(kAutofillDropdownLayoutTrailingIcon), nullptr}};
+     base::size(kAutofillDropdownLayoutLeadingIcon), nullptr},
+    {"(two line leading icon)", kAutofillDropdownLayoutTwoLinesLeadingIcon,
+     base::size(kAutofillDropdownLayoutTwoLinesLeadingIcon), nullptr}};
 #endif  // !defined(OS_ANDROID)
 
 #if defined(OS_ANDROID)