Differentiate maxColorSamples and maxStencilSamples in GrCaps

src/gpu/gl/GrGLGpu.cpp

Index: src/gpu/gl/GrGLGpu.cpp
diff --git a/src/gpu/gl/GrGLGpu.cpp b/src/gpu/gl/GrGLGpu.cpp
index 248a5dfbd250e91f45daa974be4f8b8d929324bc..185cdc26f30134ac8377cd6592ad82810394a112 100644
--- a/src/gpu/gl/GrGLGpu.cpp
+++ b/src/gpu/gl/GrGLGpu.cpp
@@ -341,7 +341,7 @@ void GrGLGpu::onResetContext(uint32_t resetBits) {
         // "opacity", which can then be blended into the color buffer to accomplish antialiasing.
         // Enable coverage modulation suitable for premultiplied alpha colors.
         // This state has no effect when not rendering to a mixed sampled target.
-        if (this->caps()->mixedSamplesSupport()) {
+        if (this->caps()->usesMixedSamples()) {
             GL_CALL(CoverageModulation(GR_GL_RGBA));
         }
     }