Add "previewing on hover" support for password field.

components/autofill/core/browser/password_autofill_manager_unittest.cc

Index: components/autofill/core/browser/password_autofill_manager_unittest.cc
diff --git a/components/autofill/core/browser/password_autofill_manager_unittest.cc b/components/autofill/core/browser/password_autofill_manager_unittest.cc
index 73241a5ff73007612dcde40a1cd0f59a91653428..45bcfb8d677e1c1ca5eeff9fc3d47b21645967c8 100644
--- a/components/autofill/core/browser/password_autofill_manager_unittest.cc
+++ b/components/autofill/core/browser/password_autofill_manager_unittest.cc
@@ -25,6 +25,7 @@ class MockAutofillDriver : public autofill::TestAutofillDriver {
   MockAutofillDriver() {}
   MOCK_METHOD1(RendererShouldAcceptPasswordAutofillSuggestion,
                void(const base::string16&));
+  MOCK_METHOD1(RendererShouldPreviewPassword, void(const base::string16&));
 };
 
 }  // namespace
@@ -99,4 +100,28 @@ TEST_F(PasswordAutofillManagerTest, DidAcceptAutofillSuggestion) {
       username_field(), base::ASCIIToUTF16(kAliceUsername)));
 }
 
+TEST_F(PasswordAutofillManagerTest, DidSelectAutofillSuggestion) {
+  EXPECT_CALL(*autofill_driver(),
+      RendererShouldPreviewPassword(
+          base::ASCIIToUTF16(kAliceUsername)));
+  EXPECT_TRUE(password_autofill_manager()->DidSelectAutofillSuggestion(
+      username_field(), base::ASCIIToUTF16(kAliceUsername)));
+
+  EXPECT_CALL(*autofill_driver(),
+      RendererShouldPreviewPassword(
+          base::ASCIIToUTF16(kInvalidUsername))).Times(0);
+  EXPECT_FALSE(password_autofill_manager()->DidSelectAutofillSuggestion(
+      username_field(), base::ASCIIToUTF16(kInvalidUsername)));
+
+  FormFieldData invalid_username_field;
+  invalid_username_field.name = base::ASCIIToUTF16(kInvalidUsername);
+
+  EXPECT_FALSE(password_autofill_manager()->DidSelectAutofillSuggestion(
+      invalid_username_field, base::ASCIIToUTF16(kAliceUsername)));
+
+  password_autofill_manager()->Reset();
+  EXPECT_FALSE(password_autofill_manager()->DidSelectAutofillSuggestion(
+      username_field(), base::ASCIIToUTF16(kAliceUsername)));
+}
+
 }  // namespace autofill