Add ToRGBHex color helper

atom/browser/api/atom_api_web_contents.cc

@@ -647,11 +647,7 @@ void WebContents::MediaStoppedPlaying(const MediaPlayerId& id) {
 }
 
 void WebContents::DidChangeThemeColor(SkColor theme_color) {
-  std::string hex_theme_color = base::StringPrintf("#%02X%02X%02X",
-    SkColorGetR(theme_color),
-    SkColorGetG(theme_color),
-    SkColorGetB(theme_color));
-  Emit("did-change-theme-color", hex_theme_color);
+  Emit("did-change-theme-color", atom::ToRGBHex(theme_color));
 }
 
 void WebContents::DocumentLoadedInFrame(

atom/common/color_util.cc

@@ -8,6 +8,7 @@
 
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
 
 namespace atom {
 
@@ -45,4 +46,11 @@ SkColor ParseHexColor(const std::string& color_string) {
   return SkColorSetARGB(bytes[0], bytes[1], bytes[2], bytes[3]);
 }
 
+std::string ToRGBHex(const SkColor color) {
+  return base::StringPrintf("#%02X%02X%02X",
+                            SkColorGetR(color),
+                            SkColorGetG(color),
+                            SkColorGetB(color));
+}
+
 }  // namespace atom

atom/common/color_util.h

@@ -14,6 +14,9 @@ namespace atom {
 // Parse hex color like "#FFF" or "#EFEFEF"
 SkColor ParseHexColor(const std::string& name);
 
+// Convert color to RGB hex value like "#ABCDEF"
+std::string ToRGBHex(const SkColor color);
+
 }  // namespace atom
 
 #endif  // ATOM_COMMON_COLOR_UTIL_H_