Extracting more than one wallpaper prominent color

chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager.cc

Index: chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager.cc
diff --git a/chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager.cc b/chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager.cc
index 8621f3677fe6f02e5de8a42746d601f3f7e9dcc0..4b27e38a6506bad624ef5dd6cd8a6351701bde40 100644
--- a/chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager.cc
+++ b/chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager.cc
@@ -63,6 +63,7 @@
 #include "content/public/common/service_manager_connection.h"
 #include "crypto/sha2.h"
 #include "services/service_manager/public/cpp/connector.h"
+#include "ui/gfx/color_analysis.h"
 #include "url/gurl.h"
 
 using content::BrowserThread;
@@ -444,9 +445,12 @@ void WallpaperManager::CalculateProminentColor(const gfx::ImageSkia& image) {
     color_calculator_.reset();
   }
 
+  // TODO(warx): this color fetching should go through ash::WallpaperController.
+  std::vector<color_utils::ColorProfile> color_profiles;
+  color_profiles.emplace_back(color_utils::LumaRange::DARK,
+                              color_utils::SaturationRange::MUTED);
   color_calculator_ = base::MakeUnique<wallpaper::WallpaperColorCalculator>(
-      image, color_utils::LumaRange::DARK, color_utils::SaturationRange::MUTED,
-      task_runner_);
+      image, color_profiles, task_runner_);
   color_calculator_->AddObserver(this);
   if (!color_calculator_->StartCalculation()) {
     color_calculator_->RemoveObserver(this);
@@ -944,7 +948,7 @@ void WallpaperManager::OnWindowDestroying(aura::Window* window) {
 }
 
 void WallpaperManager::OnColorCalculationComplete() {
-  SkColor color = color_calculator_->prominent_color();
+  SkColor color = color_calculator_->prominent_colors()[0];

[bruthig, 2017/06/21 15:54:17]

'0' seems like a magic number here.

[Qiang(Joe) Xu, 2017/06/21 22:35:27]

Done.

   color_calculator_->RemoveObserver(this);
   color_calculator_.reset();
   if (prominent_color_ == color)