Revert "Drop support for unused MSAA extensions"

This reverts commit 7df27465c4ecc8a4a0cdd95e9785c342903c2de9.

Reason for revert: experimental revert to see if this is the cause of the tree redness

Original change's description:
> Drop support for unused MSAA extensions
> 
> Bug: skia:
> Change-Id: I113b80e3f991f195155148625ceb29242ea82776
> Reviewed-on: https://skia-review.googlesource.com/101403
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Chris Dalton <csmartdalton@google.com>

TBR=bsalomon@google.com,csmartdalton@google.com,ethannicholas@google.com

Change-Id: I4fa4123e2d176bef88cd76a09a14053d9ac5809f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/101680
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>

2 files changed, 15 insertions, 0 deletions

diff --git a/src/sksl/SkSLIRGenerator.cpp b/src/sksl/SkSLIRGenerator.cpp
index 54a62cc276..3388a4758d 100644
--- a/src/sksl/SkSLIRGenerator.cpp
+++ b/src/sksl/SkSLIRGenerator.cpp
@@ -130,6 +130,9 @@ static void fill_caps(const SKSL_CAPS_CLASS& caps,
     CAP(dropsTileOnZeroDivide);
     CAP(flatInterpolationSupport);
     CAP(noperspectiveInterpolationSupport);
+    CAP(multisampleInterpolationSupport);
+    CAP(sampleVariablesSupport);
+    CAP(sampleMaskOverrideCoverageSupport);
     CAP(externalTextureSupport);
     CAP(texelFetchSupport);
     CAP(imageLoadStoreSupport);
diff --git a/src/sksl/SkSLUtil.h b/src/sksl/SkSLUtil.h
index 6eb4bbad3e..787698f2c6 100644
--- a/src/sksl/SkSLUtil.h
+++ b/src/sksl/SkSLUtil.h
@@ -99,6 +99,18 @@ public:
         return true;
     }
 
+    bool multisampleInterpolationSupport() const {
+        return true;
+    }
+
+    bool sampleVariablesSupport() const {
+        return true;
+    }
+
+    bool sampleMaskOverrideCoverageSupport() const {
+        return true;
+    }
+
     bool externalTextureSupport() const {
         return true;
     }