Bug 1316524 - Use 'media.wmf.skip-blacklist' to set some gfxVars - r=mattwoodrow

Reversing bug 1313343, as MediaPrefs are not available from the UI process.
Instead media.wmf.skip-blacklist is used when setting D3D-blacklisting gfxVars,
leaving them empty if we want to skip these blacklists.

MozReview-Commit-ID: JYED4ovC0jq

--HG--
extra : rebase_source : 087230ba95927ced52d7af502b96a988b4077c31

dom/media/platforms/wmf/WMFVideoMFTManager.cpp

@@ -18,7 +18,6 @@
 #include "mozilla/ClearOnShutdown.h"
 #include "mozilla/layers/LayersTypes.h"
 #include "MediaInfo.h"
-#include "MediaPrefs.h"
 #include "mozilla/Logging.h"
 #include "nsWindowsHelpers.h"
 #include "gfx2DGlue.h"
@@ -181,8 +180,8 @@ FindDXVABlacklistedDLL(StaticAutoPtr<D3DDLLBlacklistingCache>& aDLLBlacklistingC
     ClearOnShutdown(&aDLLBlacklistingCache);
   }
 
-  if (aBlacklist.IsEmpty() || MediaPrefs::PDMWMFSkipBlacklist()) {
-    // Empty blacklist, or "media.wmf.skip-blacklist"=true -> No blacklisting.
+  if (aBlacklist.IsEmpty()) {
+    // Empty blacklist -> No blacklisting.
     aDLLBlacklistingCache->mBlacklistPref.SetLength(0);
     aDLLBlacklistingCache->mBlacklistedDLL.SetLength(0);
     return aDLLBlacklistingCache->mBlacklistedDLL;

gfx/thebes/gfxPlatform.cpp

@@ -617,8 +617,13 @@ gfxPlatform::Init()
     if (XRE_IsParentProcess()) {
       GPUProcessManager::Initialize();
 
-      gfxVars::SetPDMWMFDisableD3D11Dlls(Preferences::GetCString("media.wmf.disable-d3d11-for-dlls"));
-      gfxVars::SetPDMWMFDisableD3D9Dlls(Preferences::GetCString("media.wmf.disable-d3d9-for-dlls"));
+      if (Preferences::GetBool("media.wmf.skip-blacklist")) {
+        gfxVars::SetPDMWMFDisableD3D11Dlls(nsCString());
+        gfxVars::SetPDMWMFDisableD3D9Dlls(nsCString());
+      } else {
+        gfxVars::SetPDMWMFDisableD3D11Dlls(Preferences::GetCString("media.wmf.disable-d3d11-for-dlls"));
+        gfxVars::SetPDMWMFDisableD3D9Dlls(Preferences::GetCString("media.wmf.disable-d3d9-for-dlls"));
+      }
     }
 
     // Drop a note in the crash report if we end up forcing an option that could