Add appIconMask to notification API

ui/message_center/views/message_view.cc

Index: ui/message_center/views/message_view.cc
diff --git a/ui/message_center/views/message_view.cc b/ui/message_center/views/message_view.cc
index 11ff5485f86612ed4314d70b68a786060404df56..3b8900c35a945aa9f1c6ae4018857d7309db9818 100644
--- a/ui/message_center/views/message_view.cc
+++ b/ui/message_center/views/message_view.cc
@@ -12,6 +12,7 @@
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
 #include "ui/gfx/canvas.h"
+#include "ui/gfx/image/image_skia_operations.h"
 #include "ui/message_center/message_center.h"
 #include "ui/message_center/message_center_style.h"
 #include "ui/message_center/views/padded_button.h"
@@ -31,6 +32,31 @@ const int kCloseIconRightPadding = 5;
 const int kShadowOffset = 1;
 const int kShadowBlur = 4;
 
+const gfx::ImageSkia CreateImage(int width, int height, SkColor color) {
+  SkBitmap bitmap;
+  bitmap.allocN32Pixels(width, height);
+  bitmap.eraseColor(color);
+  return gfx::ImageSkia::CreateFrom1xBitmap(bitmap);
+}
+
+// Take the alpha channel of small_image, mask it with the foreground,
+// then add the masked foreground on top of the background
+const gfx::ImageSkia GetMaskedSmallImage(const gfx::ImageSkia& small_image) {
+  int width = small_image.width();
+  int height = small_image.height();
+
+  // Background color grey
+  const gfx::ImageSkia background = CreateImage(
+      width, height, message_center::kSmallImageMaskBackgroundColor);
+  // Foreground color white
+  const gfx::ImageSkia foreground = CreateImage(
+      width, height, message_center::kSmallImageMaskForegroundColor);
+  const gfx::ImageSkia masked_small_image =
+      gfx::ImageSkiaOperations::CreateMaskedImage(foreground, small_image);
+  return gfx::ImageSkiaOperations::CreateSuperimposedImage(background,
+                                                           masked_small_image);
+}
+
 }  // namespace
 
 namespace message_center {
@@ -54,8 +80,9 @@ MessageView::MessageView(MessageViewController* controller,
       views::Background::CreateSolidBackground(kNotificationBackgroundColor));
   AddChildView(background_view_);
 
+  const gfx::ImageSkia masked_small_image = GetMaskedSmallImage(small_image);
   views::ImageView* small_image_view = new views::ImageView();
-  small_image_view->SetImage(small_image);
+  small_image_view->SetImage(masked_small_image);
   small_image_view->SetImageSize(gfx::Size(kSmallImageSize, kSmallImageSize));
   // The small image view should be added to view hierarchy by the derived
   // class. This ensures that it is on top of other views.
@@ -84,7 +111,9 @@ MessageView::~MessageView() {
 }
 
 void MessageView::UpdateWithNotification(const Notification& notification) {
-  small_image_view_->SetImage(notification.small_image().AsImageSkia());
+  const gfx::ImageSkia masked_small_image =
+      GetMaskedSmallImage(notification.small_image().AsImageSkia());
+  small_image_view_->SetImage(masked_small_image);
   display_source_ = notification.display_source();
 }