[Fallback icons] Change "explicit flow" interface so color hex strings don't use "#".

chrome/common/favicon/fallback_icon_url_parser.h

 // Copyright 2015 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.
 
 #ifndef CHROME_COMMON_FAVICON_FALLBACK_ICON_URL_PARSER_H_
 #define CHROME_COMMON_FAVICON_FALLBACK_ICON_URL_PARSER_H_
 
 #include <string>
 
 #include "base/gtest_prod_util.h"
@@ skipping 20 matching lines @@
   bool Parse(const std::string& path);
 
  private:
   // Parses |specs_str|, which should be the comma-separated value portion
   // in the format described at the top of the file
   // "chrome/browser/ui/webui/fallback_icon_source.h".
   static bool ParseSpecs(const std::string& specs_str,
                          int *size,
                          favicon_base::FallbackIconStyle* style);
 
-  // Helper to parse color string (e.g., "red", "#f00", "#fF0000"). Returns true
-  // on success.
+  // Helper to parse color string (e.g., "red", "#f00", "#aB0137"). On success,
+  // returns true and writes te result to |*color|.
   static bool ParseColor(const std::string& color_str, SkColor* color);
 
   friend class FallbackIconUrlParserTest;
   FRIEND_TEST_ALL_PREFIXES(FallbackIconUrlParserTest, ParseColorSuccess);
   FRIEND_TEST_ALL_PREFIXES(FallbackIconUrlParserTest, ParseColorFailure);
   FRIEND_TEST_ALL_PREFIXES(FallbackIconUrlParserTest, ParseSpecsEmpty);
   FRIEND_TEST_ALL_PREFIXES(FallbackIconUrlParserTest, ParseSpecsPartial);
   FRIEND_TEST_ALL_PREFIXES(FallbackIconUrlParserTest, ParseSpecsFull);
   FRIEND_TEST_ALL_PREFIXES(FallbackIconUrlParserTest, ParseSpecsFailure);
 
   // The page URL the fallback icon is requested for.
   GURL url_;
 
   // The size of the requested fallback icon in pixels.
   int size_in_pixels_;
 
   // Styling specifications of fallback icon.
   favicon_base::FallbackIconStyle style_;
 
   DISALLOW_COPY_AND_ASSIGN(ParsedFallbackIconPath);
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_COMMON_FAVICON_FALLBACK_ICON_URL_PARSER_H_