Fix GrProgramsTest to not generate tests with too many TexCoord references

src/gpu/gl/GrGLShaderBuilder.cpp

Index: src/gpu/gl/GrGLShaderBuilder.cpp
diff --git a/src/gpu/gl/GrGLShaderBuilder.cpp b/src/gpu/gl/GrGLShaderBuilder.cpp
index 71942404e7e6c080f5a0489bcdc0ad5ef7bd2d07..4d8df4e3b7e83761854bfe7d6292378893bc990b 100644
--- a/src/gpu/gl/GrGLShaderBuilder.cpp
+++ b/src/gpu/gl/GrGLShaderBuilder.cpp
@@ -943,6 +943,13 @@ GrGLFragmentOnlyShaderBuilder::GrGLFragmentOnlyShaderBuilder(GrGpuGL* gpu,
     SkASSERT(GrGLProgramDesc::kAttribute_ColorInput != desc.getHeader().fCoverageInput);
 }
 
+int GrGLFragmentOnlyShaderBuilder::addTexCoordSets(int count) {
+    int firstFreeCoordSet = fNumTexCoordSets;
+    fNumTexCoordSets += count;
+    SkASSERT(gpu()->glCaps().maxFixedFunctionTextureCoords() >= fNumTexCoordSets);
+    return firstFreeCoordSet;
+}
+
 GrGLProgramEffects* GrGLFragmentOnlyShaderBuilder::createAndEmitEffects(
         const GrEffectStage* effectStages[],
         const EffectKey effectKeys[],