Revert "Revert "Revert "Revert "Revert "Revert "Redefine the meaning of sample counts in GPU backend.""""""

This reverts commit 3a2cc2c2ec124de36d2544b2a523ef1dd317ca32.

Fix code with samplecnt=0 that slipped in between trybots/CQ and landing of previous version

Change-Id: Iab19f2e8d1e9901601c8c76244d7a88c5d707fab
Reviewed-on: https://skia-review.googlesource.com/103181
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/gl/GrGLStencilAttachment.cpp b/src/gpu/gl/GrGLStencilAttachment.cpp
index aa813ed..5c07a7d 100644
--- a/src/gpu/gl/GrGLStencilAttachment.cpp
+++ b/src/gpu/gl/GrGLStencilAttachment.cpp
@@ -14,7 +14,7 @@
     uint64_t size = this->width();
     size *= this->height();
     size *= fFormat.fTotalBits;
-    size *= SkTMax(1,this->numSamples());
+    size *= this->numSamples();
     return static_cast<size_t>(size / 8);
 }