[Favicon] Add new fallback icon rendering flow.

components/favicon_base/favicon_types.cc

Index: components/favicon_base/favicon_types.cc
diff --git a/components/favicon_base/favicon_types.cc b/components/favicon_base/favicon_types.cc
index eb0e7bcfa6b0a662720117c33c24ff5abd1b43de..dc273b5ba0423e93d9919cc4a0af5626fa3f46fc 100644
--- a/components/favicon_base/favicon_types.cc
+++ b/components/favicon_base/favicon_types.cc
@@ -6,14 +6,15 @@
 
 namespace favicon_base {
 
-// FaviconImageResult ---------------------------------------------------------
+// ---------------------------------------------------------
+// FaviconImageResult
 
 FaviconImageResult::FaviconImageResult() {}
 
 FaviconImageResult::~FaviconImageResult() {}
 
-// FaviconRawBitmapResult
 // --------------------------------------------------------
+// FaviconRawBitmapResult
 
 FaviconRawBitmapResult::FaviconRawBitmapResult()
     : expired(false), icon_type(INVALID_ICON) {
@@ -22,4 +23,17 @@ FaviconRawBitmapResult::FaviconRawBitmapResult()
 FaviconRawBitmapResult::~FaviconRawBitmapResult() {
 }
 
-}  // namespace chrome
+// --------------------------------------------------------
+// FallbackIconSpecs
+
+FallbackIconSpecs::FallbackIconSpecs()
+    : background_color(SK_ColorTRANSPARENT),
+      text_color(SK_ColorTRANSPARENT),
+      font_size_ratio(0.0),
+      corner_radius_ratio(0.0) {
+}
+
+FallbackIconSpecs::~FallbackIconSpecs() {
+}
+
+}  // namespace favicon_base