chromium: Fix building with WineVine components

Before version 54, the WideVine CDM plugin was built unconditionally and
it seems since version 54 this now is dependent upon a GYP/GN flag on
whether to include the CDM shared library or not.

Also, we now use a patch from Gentoo which should hopefully get the CDM
plugin to work properly, at least according to their bugtracker:

https://bugs.gentoo.org/show_bug.cgi?id=547630

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

pkgs/applications/networking/browsers/chromium/browser.nix

@@ -18,6 +18,11 @@ mkChromiumDerivation (base: rec {
     cp -vLR "$buildPath/locales" "$buildPath/resources" "$libExecPath/"
     cp -v "$buildPath/chrome" "$libExecPath/$packageName"
 
+    if [ -e "$buildPath/libwidevinecdmadapter.so" ]; then
+      cp -v "$buildPath/libwidevinecdmadapter.so" \
+            "$libExecPath/libwidevinecdmadapter.so"
+    fi
+
     mkdir -p "$sandbox/bin"
     cp -v "$buildPath/chrome_sandbox" "$sandbox/bin/${sandboxExecutableName}"
 

pkgs/applications/networking/browsers/chromium/common.nix

@@ -23,6 +23,7 @@
 , enableSELinux ? false, libselinux ? null
 , enableNaCl ? false
 , enableHotwording ? false
+, enableWideVine ? false
 , gnomeSupport ? false, gnome ? null
 , gnomeKeyringSupport ? false, libgnome_keyring3 ? null
 , proprietaryCodecs ? true
@@ -102,10 +103,9 @@ let
       ++ optional pulseSupport libpulseaudio;
 
     patches = [
-      ./patches/widevine.patch
       ./patches/glibc-2.24.patch
       ./patches/nix_plugin_paths_52.patch
-    ];
+    ] ++ optional enableWideVine ./patches/widevine.patch;
 
     postPatch = ''
       # We want to be able to specify where the sandbox is via CHROME_DEVEL_SANDBOX
@@ -147,6 +147,7 @@ let
       use_gio = gnomeSupport;
       enable_nacl = enableNaCl;
       enable_hotwording = enableHotwording;
+      enable_widevine = enableWideVine;
       selinux = enableSELinux;
       use_cups = cupsSupport;
     } // {

pkgs/applications/networking/browsers/chromium/default.nix

@@ -22,7 +22,8 @@ let
 
     mkChromiumDerivation = callPackage ./common.nix {
       inherit enableSELinux enableNaCl enableHotwording gnomeSupport gnome
-              gnomeKeyringSupport proprietaryCodecs cupsSupport pulseSupport;
+              gnomeKeyringSupport proprietaryCodecs cupsSupport pulseSupport
+              enableWideVine;
     };
 
     browser = callPackage ./browser.nix { inherit channel; };

pkgs/applications/networking/browsers/chromium/patches/widevine.patch

@@ -1,12 +1,16 @@
-diff -upr chromium-42.0.2311.90.orig/third_party/widevine/cdm/widevine_cdm_version.h chromium-42.0.2311.90/third_party/widevine/cdm/widevine_cdm_version.h
+Minimal WideVine patch from Gentoo:
---- chromium-42.0.2311.90.orig/third_party/widevine/cdm/widevine_cdm_version.h	2015-04-15 01:18:59.000000000 +0300
+
-+++ chromium-42.0.2311.90/third_party/widevine/cdm/widevine_cdm_version.h	2015-04-15 09:09:49.157260050 +0300
+https://gitweb.gentoo.org/repo/gentoo.git/tree/www-client/chromium/files/chromium-widevine-r1.patch
-@@ -14,4 +14,8 @@
+
- //  - WIDEVINE_CDM_VERSION_STRING (with the version of the CDM that's available
+BTS: https://bugs.gentoo.org/show_bug.cgi?id=547630
- //    as a string, e.g., "1.0.123.456").
+
+--- a/third_party/widevine/cdm/stub/widevine_cdm_version.h
++++ b/third_party/widevine/cdm/stub/widevine_cdm_version.h
+@@ -10,6 +10,7 @@
+ 
+ #include "third_party/widevine/cdm/widevine_cdm_common.h"
+ 
++#define WIDEVINE_CDM_VERSION_STRING "unknown"
+ #define WIDEVINE_CDM_AVAILABLE
  
-+#include "third_party/widevine/cdm/widevine_cdm_common.h"
-+#define WIDEVINE_CDM_AVAILABLE
-+#define WIDEVINE_CDM_VERSION_STRING "@WIDEVINE_VERSION@"
-+
  #endif  // WIDEVINE_CDM_VERSION_H_