re-land of new SkSL precisions

Bug: skia:
Change-Id: Ic1deb3db2cbda6ca45f93dee99832971a36a2119
Reviewed-on: https://skia-review.googlesource.com/47841
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
diff --git a/tests/PrimitiveProcessorTest.cpp b/tests/PrimitiveProcessorTest.cpp
index 1e764e1..47dff33 100644
--- a/tests/PrimitiveProcessorTest.cpp
+++ b/tests/PrimitiveProcessorTest.cpp
@@ -72,8 +72,8 @@
                         args.fVaryingHandler->emitAttributes(gp);
                         this->writeOutputPosition(args.fVertBuilder, gpArgs, gp.getAttrib(0).fName);
                         GrGLSLPPFragmentBuilder* fragBuilder = args.fFragBuilder;
-                        fragBuilder->codeAppendf("%s = float4(1);", args.fOutputColor);
-                        fragBuilder->codeAppendf("%s = float4(1);", args.fOutputCoverage);
+                        fragBuilder->codeAppendf("%s = half4(1);", args.fOutputColor);
+                        fragBuilder->codeAppendf("%s = half4(1);", args.fOutputCoverage);
                     }
                     void setData(const GrGLSLProgramDataManager& pdman,
                                  const GrPrimitiveProcessor& primProc,