Implement input type=color UI (mac part)

content/browser/renderer_host/render_widget_host_view_mac.mm

Index: content/browser/renderer_host/render_widget_host_view_mac.mm
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.mm b/content/browser/renderer_host/render_widget_host_view_mac.mm
index 25ee3ef43a73bfc0ef2a7445312dc43a12aa8270..b783f59c219a44f788ba02273ab830b43fa793d0 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac.mm
@@ -17,6 +17,7 @@
 #include "base/sys_info.h"
 #include "base/sys_string_conversions.h"
 #include "base/utf_string_conversions.h"
+#import "chrome/browser/ui/cocoa/color_utils.h"
 #import "content/browser/accessibility/browser_accessibility_cocoa.h"
 #include "content/browser/gpu/gpu_process_host.h"
 #include "content/browser/gpu/gpu_process_host_ui_shim.h"
@@ -119,18 +120,6 @@ namespace {
 // Maximum number of characters we allow in a tooltip.
 const size_t kMaxTooltipLength = 1024;
 
-// TODO(suzhe): Upstream this function.
-WebKit::WebColor WebColorFromNSColor(NSColor *color) {
-  CGFloat r, g, b, a;
-  [color getRed:&r green:&g blue:&b alpha:&a];
-
-  return
-      std::max(0, std::min(static_cast<int>(lroundf(255.0f * a)), 255)) << 24 |
-      std::max(0, std::min(static_cast<int>(lroundf(255.0f * r)), 255)) << 16 |
-      std::max(0, std::min(static_cast<int>(lroundf(255.0f * g)), 255)) << 8  |
-      std::max(0, std::min(static_cast<int>(lroundf(255.0f * b)), 255));
-}
-
 // Extract underline information from an attributed string. Mostly copied from
 // third_party/WebKit/Source/WebKit/mac/WebView/WebHTMLView.mm
 void ExtractUnderlines(