Desaturate the favicon shown in the tab when a network error is encountered

chrome/browser/ui/views/tabs/tab.cc

Index: chrome/browser/ui/views/tabs/tab.cc
diff --git a/chrome/browser/ui/views/tabs/tab.cc b/chrome/browser/ui/views/tabs/tab.cc
index 4b854bcfbe4b1bf089ab06e6bbaf58f9954d4cd4..fa4554d56d6d7d17ed67090d25d2f96e332c423a 100644
--- a/chrome/browser/ui/views/tabs/tab.cc
+++ b/chrome/browser/ui/views/tabs/tab.cc
@@ -31,6 +31,7 @@
 #include "grit/components_strings.h"
 #include "grit/theme_resources.h"
 #include "third_party/skia/include/effects/SkGradientShader.h"
+#include "third_party/skia/include/effects/SkLumaColorFilter.h"
 #include "third_party/skia/include/pathops/SkPathOps.h"
 #include "ui/accessibility/ax_view_state.h"
 #include "ui/base/l10n/l10n_util.h"
@@ -897,7 +898,6 @@ bool Tab::IsSelected() const {
 
 void Tab::SetData(const TabRendererData& data) {
   DCHECK(GetWidget());
-
   if (data_.Equals(data))
     return;
 
@@ -1657,9 +1657,25 @@ void Tab::PaintIcon(gfx::Canvas* canvas) {
       !should_display_crashed_favicon_) {
     PaintPinnedTabTitleChangedIndicatorAndIcon(canvas, bounds);
   } else if (!favicon_.isNull()) {
-    canvas->DrawImageInt(favicon_, 0, 0, bounds.width(), bounds.height(),
-                         bounds.x(), bounds.y(), bounds.width(),
-                         bounds.height(), false);
+    // Desaturate favicons of tabs with network errors.
+    if (data().network_error) {
+      SkPaint paint;
+      paint.setStyle(SkPaint::kFill_Style);
+      paint.setAntiAlias(true);
+      SkScalar desaturate[20] = {0.3086f, 0.6094f, 0.0820f, 0.0f, 0.0f,
+                                 0.3086f, 0.6094f, 0.0820f, 0.0f, 0.0f,
+                                 0.3086f, 0.6094f, 0.0820f, 0.0f, 0.0f,
+                                 0.0f,    0.0f,    0.0f,    0.8f, 0.0f};
+      paint.setColorFilter(
+          SkColorFilter::MakeMatrixFilterRowMajor255(desaturate));
+      canvas->DrawImageInt(favicon_, 0, 0, bounds.width(), bounds.height(),
+                           bounds.x(), bounds.y(), bounds.width(),
+                           bounds.height(), false, paint);
+    } else {
+      canvas->DrawImageInt(favicon_, 0, 0, bounds.width(), bounds.height(),
+                           bounds.x(), bounds.y(), bounds.width(),
+                           bounds.height(), false);
+    }
   }
 }