Track when fallback icon color is the default.

components/favicon/core/large_icon_service_unittest.cc

Index: components/favicon/core/large_icon_service_unittest.cc
diff --git a/components/favicon/core/large_icon_service_unittest.cc b/components/favicon/core/large_icon_service_unittest.cc
index 3618fd5dbe008e9f2a389fd14e3b2d97e1538340..e3bc5f9c5607166ac290dbe40bf4dcfc75f9bbcb 100644
--- a/components/favicon/core/large_icon_service_unittest.cc
+++ b/components/favicon/core/large_icon_service_unittest.cc
@@ -213,6 +213,7 @@ TEST_F(LargeIconServiceTest, FallbackSinceIconTooSmall) {
   mock_favicon_service_->InjectResult(CreateTestBitmap(16, 16, kTestColor));
   expected_fallback_icon_style_.reset(new favicon_base::FallbackIconStyle);
   expected_fallback_icon_style_->background_color = kTestColor;
+  expected_fallback_icon_style_->is_default_background_color = false;
   large_icon_service_->GetLargeIconOrFallbackStyle(
       GURL(kDummyUrl),
       24,
@@ -227,6 +228,7 @@ TEST_F(LargeIconServiceTest, FallbackSinceIconNotSquare) {
   mock_favicon_service_->InjectResult(CreateTestBitmap(24, 32, kTestColor));
   expected_fallback_icon_style_.reset(new favicon_base::FallbackIconStyle);
   expected_fallback_icon_style_->background_color = kTestColor;
+  expected_fallback_icon_style_->is_default_background_color = false;
   large_icon_service_->GetLargeIconOrFallbackStyle(
       GURL(kDummyUrl),
       24,
@@ -271,6 +273,7 @@ TEST_F(LargeIconServiceTest, FallbackSinceTooPicky) {
   mock_favicon_service_->InjectResult(CreateTestBitmap(24, 24, kTestColor));
   expected_fallback_icon_style_.reset(new favicon_base::FallbackIconStyle);
   expected_fallback_icon_style_->background_color = kTestColor;
+  expected_fallback_icon_style_->is_default_background_color = false;
   large_icon_service_->GetLargeIconOrFallbackStyle(
       GURL(kDummyUrl),
       32,