Back out 8be2344dcff3 (bug 1089008) for OS X bustage.

browser/components/nsBrowserGlue.js

@@ -2527,14 +2527,11 @@ let E10SUINotification = {
       } catch(e) {}
 
       let isHardwareAccelerated = true;
-      // Linux and Windows are currently ok, mac not so much.
-#ifdef XP_MACOSX
       try {
         let win = RecentWindow.getMostRecentBrowserWindow();
         let winutils = win.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(Ci.nsIDOMWindowUtils);
         isHardwareAccelerated = winutils.layerManagerType != "Basic";
       } catch (e) {}
-#endif
 
       if (!Services.appinfo.inSafeMode &&
           !Services.appinfo.accessibilityEnabled &&

toolkit/xre/nsAppRunner.cpp

@@ -4613,24 +4613,43 @@ mozilla::BrowserTabsRemoteAutostart()
   }
 #endif
 
-#if defined(XP_MACOSX)
+#if defined(XP_WIN) || defined(XP_MACOSX)
   // If for any reason we suspect acceleration will be disabled, disabled
-  // e10s auto start on mac.
+  // e10s auto start. (bug 1068199) THIS IS A TEMPORARY WORKAROUND.
   if (gBrowserTabsRemoteAutostart) {
     // Check prefs
     bool accelDisabled = Preferences::GetBool("layers.acceleration.disabled", false) &&
                          !Preferences::GetBool("layers.acceleration.force-enabled", false);
 
+#if defined(XP_MACOSX)
     accelDisabled = accelDisabled || !nsCocoaFeatures::AccelerateByDefault();
+#endif
 
     // Check for blocked drivers
     if (!accelDisabled) {
       nsCOMPtr<nsIGfxInfo> gfxInfo = do_GetService("@mozilla.org/gfx/info;1");
       if (gfxInfo) {
         int32_t status;
-        if (NS_SUCCEEDED(gfxInfo->GetFeatureStatus(nsIGfxInfo::FEATURE_OPENGL_LAYERS, &status)) &&
-            status != nsIGfxInfo::FEATURE_STATUS_OK) {
-          accelDisabled = true;
+#if defined(XP_WIN)
+        long flagsToCheck[4] = {
+          nsIGfxInfo::FEATURE_DIRECT3D_9_LAYERS,
+          nsIGfxInfo::FEATURE_DIRECT3D_10_LAYERS,
+          nsIGfxInfo::FEATURE_DIRECT3D_10_1_LAYERS,
+          nsIGfxInfo::FEATURE_DIRECT3D_11_LAYERS
+        };
+#elif defined(XP_MACOSX)
+        long flagsToCheck[1] = {
+          nsIGfxInfo::FEATURE_OPENGL_LAYERS
+        };
+#endif
+        for (unsigned int idx = 0; idx < ArrayLength(flagsToCheck); idx++) {
+          if (NS_SUCCEEDED(gfxInfo->GetFeatureStatus(flagsToCheck[idx], &status))) {
+            if (status != nsIGfxInfo::FEATURE_STATUS_OK) {
+              accelDisabled = true;
+              break;
+            }
+          }
+        }
       }
     }
 
@@ -4647,7 +4666,7 @@ mozilla::BrowserTabsRemoteAutostart()
       LogE10sBlockedReason("Hardware acceleration is disabled");
     }
   }
-#endif // defined(XP_MACOSX)
+#endif
 
   mozilla::Telemetry::Accumulate(mozilla::Telemetry::E10S_AUTOSTART, gBrowserTabsRemoteAutostart);
   if (Preferences::GetBool("browser.enabledE10SFromPrompt", false)) {