nexus 9 fix

TBR=
BUG=skia:

Review URL: https://codereview.chromium.org/966773004

diff --git a/src/gpu/GrContext.cpp b/src/gpu/GrContext.cpp
index 679ee84..ac44644 100755 (executable)
--- a/src/gpu/GrContext.cpp
+++ b/src/gpu/GrContext.cpp
@@ -849,7 +849,7 @@ public:
     }
 
     void getInvariantOutputCoverage(GrInitInvariantOutput* out) const SK_OVERRIDE {
-        out->setUnknownSingleComponent();
+        out->setKnownSingleComponent(0xff);
     }
 
     void initBatchTracker(const GrPipelineInfo& init) SK_OVERRIDE {