Adds more metadata to the about:webapks page

ui/gfx/color_utils.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gfx/color_utils.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 #include <cmath>
 
 #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"
 #include "ui/gfx/geometry/safe_integer_conversions.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include "skia/ext/skia_utils_win.h"
 #endif
 
@@ skipping 316 matching lines @@
   if (IsDark(text_color)) {
     // For black text, this comes out to kChromeIconGrey.
     return color_utils::AlphaBlend(SK_ColorWHITE, text_color,
                                    SkColorGetR(gfx::kChromeIconGrey));
   }
   // For a light color, just reduce opacity.
   return SkColorSetA(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