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>
diff --git a/src/gpu/ops/GrAAConvexPathRenderer.cpp b/src/gpu/ops/GrAAConvexPathRenderer.cpp
index a5cc8aa..badaadd 100644
--- a/src/gpu/ops/GrAAConvexPathRenderer.cpp
+++ b/src/gpu/ops/GrAAConvexPathRenderer.cpp
@@ -573,7 +573,7 @@
             // Setup pass through color
             varyingHandler->addPassThroughAttribute(qe.fInColor, args.fOutputColor);
 
-            GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
+            GrGLSLPPFragmentBuilder* fragBuilder = args.fFragBuilder;
 
             // Setup position
             this->writeOutputPosition(vertBuilder, gpArgs, qe.fInPosition->fName);
diff --git a/src/gpu/ops/GrDashOp.cpp b/src/gpu/ops/GrDashOp.cpp
index 0cd087f..9728aa9 100644
--- a/src/gpu/ops/GrDashOp.cpp
+++ b/src/gpu/ops/GrDashOp.cpp
@@ -919,7 +919,7 @@
     varyingHandler->addVarying("CircleParams", &circleParams);
     vertBuilder->codeAppendf("%s = %s;", circleParams.vsOut(), dce.inCircleParams()->fName);
 
-    GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
+    GrGLSLPPFragmentBuilder* fragBuilder = args.fFragBuilder;
     // Setup pass through color
     this->setupUniformColor(fragBuilder, uniformHandler, args.fOutputColor, &fColorUniform);
 
@@ -1122,7 +1122,7 @@
     varyingHandler->addVarying("RectParams", &inRectParams);
     vertBuilder->codeAppendf("%s = %s;", inRectParams.vsOut(), de.inRectParams()->fName);
 
-    GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
+    GrGLSLPPFragmentBuilder* fragBuilder = args.fFragBuilder;
     // Setup pass through color
     this->setupUniformColor(fragBuilder, uniformHandler, args.fOutputColor, &fColorUniform);
 
diff --git a/src/gpu/ops/GrMSAAPathRenderer.cpp b/src/gpu/ops/GrMSAAPathRenderer.cpp
index 306feb5..842d710 100644
--- a/src/gpu/ops/GrMSAAPathRenderer.cpp
+++ b/src/gpu/ops/GrMSAAPathRenderer.cpp
@@ -153,7 +153,7 @@
                                  qp.inPosition()->asShaderVar(), SkMatrix::I(),
                                  args.fFPCoordTransformHandler);
 
-            GrGLSLFragmentBuilder* fsBuilder = args.fFragBuilder;
+            GrGLSLPPFragmentBuilder* fsBuilder = args.fFragBuilder;
             fsBuilder->codeAppendf("if (%s.x * %s.x >= %s.y) discard;", uv.fsIn(), uv.fsIn(),
                                                                         uv.fsIn());
             fsBuilder->codeAppendf("%s = half4(1.0);", args.fOutputCoverage);
diff --git a/src/gpu/ops/GrOvalOpFactory.cpp b/src/gpu/ops/GrOvalOpFactory.cpp
index e727047..9194f67 100644
--- a/src/gpu/ops/GrOvalOpFactory.cpp
+++ b/src/gpu/ops/GrOvalOpFactory.cpp
@@ -113,7 +113,7 @@
             GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder;
             GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler;
             GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
-            GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
+            GrGLSLPPFragmentBuilder* fragBuilder = args.fFragBuilder;
 
             // emit attributes
             varyingHandler->emitAttributes(cgp);
@@ -281,7 +281,7 @@
             varyingHandler->addVarying("EllipseRadii", &ellipseRadii);
             vertBuilder->codeAppendf("%s = %s;", ellipseRadii.vsOut(), egp.fInEllipseRadii->fName);
 
-            GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
+            GrGLSLPPFragmentBuilder* fragBuilder = args.fFragBuilder;
             // setup pass through color
             varyingHandler->addPassThroughAttribute(egp.fInColor, args.fOutputColor);
 
@@ -420,7 +420,7 @@
             varyingHandler->addVarying("EllipseOffsets1", &offsets1);
             vertBuilder->codeAppendf("%s = %s;", offsets1.vsOut(), diegp.fInEllipseOffsets1->fName);
 
-            GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
+            GrGLSLPPFragmentBuilder* fragBuilder = args.fFragBuilder;
             varyingHandler->addPassThroughAttribute(diegp.fInColor, args.fOutputColor);
 
             // Setup position