diff -Naur chromium.orig/gtk3-fix.patch chromium/gtk3-fix.patch
--- chromium.orig/gtk3-fix.patch	1970-01-01 01:00:00.000000000 +0100
+++ chromium/gtk3-fix.patch	2016-10-16 13:28:51.952820267 +0200
@@ -0,0 +1,27 @@
+--- chromium-52.0.2743.82.orig/chrome/browser/ui/libgtk2ui/native_theme_gtk2.cc	2016-07-23 20:22:44.965804588 +0000
++++ chromium-52.0.2743.82/chrome/browser/ui/libgtk2ui/native_theme_gtk2.cc	2016-07-23 20:24:05.772234006 +0000
+@@ -138,6 +138,11 @@
+       gtk_widget_get_style_context(widget), stateMap[state], &color);
+   G_GNUC_END_IGNORE_DEPRECATIONS
+ 
++  if (color.alpha == 0.0)
++    gtk_style_context_get_background_color(
++        gtk_widget_get_style_context(gtk_widget_get_toplevel(widget)),
++        stateMap[state], &color);
++
+   // Hack for default color
+   if (color.alpha == 0.0)
+     color = {1, 1, 1, 1};
+@@ -510,8 +515,11 @@
+ GtkWidget* NativeThemeGtk2::GetLabel() const {
+   static GtkWidget* fake_label = NULL;
+ 
+-  if (!fake_label)
++  if (!fake_label) {
+     fake_label = gtk_label_new("");
++    gtk_style_context_add_class(
++        gtk_widget_get_style_context(fake_label), "gtkstyle-fallback");
++  }
+ 
+   return fake_label;
+ }
diff -Naur chromium.orig/PKGBUILD chromium/PKGBUILD
--- chromium.orig/PKGBUILD	2016-10-16 13:35:26.552258000 +0200
+++ chromium/PKGBUILD	2016-10-16 13:35:46.609589976 +0200
@@ -12,11 +12,11 @@
 arch=('i686' 'x86_64')
 url="http://www.chromium.org/"
 license=('BSD')
-depends=('gtk2' 'nss' 'alsa-lib' 'xdg-utils' 'bzip2' 'libxss' 'libexif'
+depends=('gtk3' 'nss' 'alsa-lib' 'xdg-utils' 'bzip2' 'libxss' 'libexif'
          'libgcrypt' 'ttf-font' 'systemd' 'dbus' 'flac' 'libpulse' 'harfbuzz'
          'perl' 'perl-file-basedir' 'desktop-file-utils' 'hicolor-icon-theme'
          'pciutils')
-makedepends=('python2' 'gperf' 'yasm' 'mesa' 'ninja' 'python2-jinja'
+makedepends=('gtk2' 'python2' 'gperf' 'yasm' 'mesa' 'ninja' 'python2-jinja'
              'python2-markupsafe' 'python2-ply' 'python2-beautifulsoup4'
              'python2-html5lib')
 optdepends=('kdebase-kdialog: needed for file dialogs in KDE'
@@ -29,13 +29,15 @@
         chromium.desktop
         chromium-52.0.2743.116-unset-madv_free.patch
         chromium-53.0.2785.92-last-commit-position.patch
-        chromium-widevine.patch)
+        chromium-widevine.patch
+        gtk3-fix.patch)
 sha256sums=('df89c284b0109566acc6a5a1a84d94a5ab0509cc3a86a31299a50328991edcde'
             '8b01fb4efe58146279858a754d90b49e5a38c9a0b36a1f84cbb7d12f92b84c28'
             '028a748a5c275de9b8f776f97909f999a8583a4b77fd1cd600b4fc5c0c3e91e9'
             '3b3aa9e28f29e6f539ed1c7832e79463b13128863a02e9c6fecd16c30d61c227'
             '9502a4d7e825a21ae63cced5715e5f06d983033b623cd41d94d1e38a70f29310'
-            'd6fdcb922e5a7fbe15759d39ccc8ea4225821c44d98054ce0f23f9d1f00c9808')
+            'd6fdcb922e5a7fbe15759d39ccc8ea4225821c44d98054ce0f23f9d1f00c9808'
+            'aa22e99d559a8c441f4ba21e4916671428326d92cf2f429c5226840ef4ea0892')
 
 # Google API keys (see http://www.chromium.org/developers/how-tos/api-keys)
 # Note: These are for Arch Linux use ONLY. For your own distribution, please
@@ -214,6 +216,9 @@
   sed "s/@WIDEVINE_VERSION@/Pinkie Pie/" ../chromium-widevine.patch |
     patch -Np1
 
+  # Fix gtk3 theme integration
+  patch -p1 -i "$srcdir"/gtk3-fix.patch
+
   # Disable MADV_FREE (if set by glibc)
   # https://bugzilla.redhat.com/show_bug.cgi?id=1361157
   patch -Np1 -i ../chromium-52.0.2743.116-unset-madv_free.patch
@@ -271,7 +276,7 @@
     'use_gconf=false'
     "use_gio=false"
     "use_gnome_keyring=false"
-    "use_gtk3=false"
+    "use_gtk3=true"
     "use_pulseaudio=true"
     "link_pulseaudio=true"
     'use_kerberos=true'
@@ -288,7 +293,7 @@
     'clang_use_chrome_plugins=false'
   )
 
-  make -C "$srcdir/chromium-launcher-$_launcher_ver" PREFIX=/usr
+  make -C "$srcdir/chromium-launcher-$_launcher_ver" PREFIX=/usr GTK=3
 
   cd "$srcdir/$pkgname-$pkgver"
   export PATH="$srcdir/python2-path:$PATH"