Adds more metadata to the about:webapks page

ui/gfx/color_utils.cc

Index: ui/gfx/color_utils.cc
diff --git a/ui/gfx/color_utils.cc b/ui/gfx/color_utils.cc
index e35d7b33fb8dc8576969c3908e2da96541060f3a..95dea0936c0fc4d35494ef7ed8e450b7873c013f 100644
--- a/ui/gfx/color_utils.cc
+++ b/ui/gfx/color_utils.cc
@@ -11,6 +11,8 @@
 
 #include "base/logging.h"
 #include "base/numerics/safe_conversions.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/stringprintf.h"
 #include "build/build_config.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/color_palette.h"
@@ -347,4 +349,17 @@ SkColor DeriveDefaultIconColor(SkColor text_color) {
                      static_cast<int>(0.8f * SkColorGetA(text_color)));
 }
 
+std::string SkColorToRgbaString(SkColor color) {
+  // We convert the alpha using DoubleToString because StringPrintf will use
+  // locale specific formatters (e.g., use , instead of . in German).
+  return base::StringPrintf(
+      "rgba(%s,%s)", SkColorToRgbString(color).c_str(),
+      base::DoubleToString(SkColorGetA(color) / 255.0).c_str());
+}
+
+std::string SkColorToRgbString(SkColor color) {
+  return base::StringPrintf("%d,%d,%d", SkColorGetR(color), SkColorGetG(color),
+                            SkColorGetB(color));
+}
+
 }  // namespace color_utils