Bug 1640170 - Enable WebRender on gen[7-8] gt1. r=aosmond

Things are better and we don't tend to be shader execution bound.
Let's find out if there's a reason to not be on gt1

Differential Revision: https://phabricator.services.mozilla.com/D76479

widget/GfxDriverInfo.cpp

@@ -455,6 +455,14 @@ const GfxDeviceFamily* GfxDriverInfo::GetDeviceFamily(DeviceFamily id) {
       APPEND_RANGE(0x06c0, INT32_MAX);
       break;
     case DeviceFamily::IntelRolloutWebRender:
+      // broadwell gt1 (gen8)
+      APPEND_DEVICE(0x1602);
+      APPEND_DEVICE(0x1606);
+      APPEND_DEVICE(0x160a);
+      APPEND_DEVICE(0x160b);
+      APPEND_DEVICE(0x160d);
+      APPEND_DEVICE(0x160e);
+
       // broadwell gt2+ (gen8)
       APPEND_DEVICE(0x1612);
       APPEND_DEVICE(0x1616);
@@ -477,6 +485,29 @@ const GfxDeviceFamily* GfxDriverInfo::GetDeviceFamily(DeviceFamily id) {
 
 #if defined(MOZ_WIDGET_GTK) || defined(NIGHTLY_BUILD)
       // Gen7.5 not allowed until bug 1576637 is resolved.
+      // gen7.5 gt1
+      APPEND_DEVICE(0x0402);
+      APPEND_DEVICE(0x0406);
+      APPEND_DEVICE(0x040a);
+      APPEND_DEVICE(0x040b);
+      APPEND_DEVICE(0x040e);
+      APPEND_DEVICE(0x0a02);
+      APPEND_DEVICE(0x0a06);
+      APPEND_DEVICE(0x0a0a);
+      APPEND_DEVICE(0x0a0b);
+      APPEND_DEVICE(0x0a0e);
+      APPEND_DEVICE(0x0c02);
+      APPEND_DEVICE(0x0c06);
+      APPEND_DEVICE(0x0c0c);
+      APPEND_DEVICE(0x0c0b);
+      APPEND_DEVICE(0x0c0e);
+      APPEND_DEVICE(0x0d02);
+      APPEND_DEVICE(0x0d06);
+      APPEND_DEVICE(0x0d0a);
+      APPEND_DEVICE(0x0d0b);
+      APPEND_DEVICE(0x0d0e);
+
+      // gen7.5 gt2
       APPEND_DEVICE(0x0412);
       APPEND_DEVICE(0x0416);
       APPEND_DEVICE(0x041a);
@@ -511,7 +542,12 @@ const GfxDeviceFamily* GfxDriverInfo::GetDeviceFamily(DeviceFamily id) {
       APPEND_DEVICE(0x0d2b);
       APPEND_DEVICE(0x0d2e);
 
-      // Gen7 gt2
+      // gen7 gt1
+      APPEND_DEVICE(0x0152);
+      APPEND_DEVICE(0x0156);
+      APPEND_DEVICE(0x015a);
+
+      // gen7 gt2
       APPEND_DEVICE(0x0162);
       APPEND_DEVICE(0x0166);
       APPEND_DEVICE(0x016a);