Differentiate maxColorSamples and maxStencilSamples in GrCaps

src/gpu/GrGpu.cpp

Index: src/gpu/GrGpu.cpp
diff --git a/src/gpu/GrGpu.cpp b/src/gpu/GrGpu.cpp
index 2815f612d602707c2186d1348d8deca5ba45c426..b4572d55d80f9e255fc4c65271beb7e7e09c0800 100644
--- a/src/gpu/GrGpu.cpp
+++ b/src/gpu/GrGpu.cpp
@@ -124,7 +124,11 @@ GrTexture* GrGpu::createTexture(const GrSurfaceDesc& origDesc, bool budgeted,
     GrGpuResource::LifeCycle lifeCycle = budgeted ? GrGpuResource::kCached_LifeCycle :
                                                     GrGpuResource::kUncached_LifeCycle;
 
-    desc.fSampleCnt = SkTMin(desc.fSampleCnt, this->caps()->maxSampleCount());
+    // We require the sample count to be less than both the max color sample count and
+    // max stencil sample count supported by the system
+    int maxSampleCount = SkTMin(this->caps()->maxColorSampleCount(),
+                                this->caps()->maxStencilSampleCount());
+    desc.fSampleCnt = SkTMin(desc.fSampleCnt, maxSampleCount);
     // Attempt to catch un- or wrongly initialized sample counts;
     SkASSERT(desc.fSampleCnt >= 0 && desc.fSampleCnt <= 64);