Revert of Patch to remove constant attributes

src/gpu/gl/GrGLProgramDesc.cpp

Index: src/gpu/gl/GrGLProgramDesc.cpp
diff --git a/src/gpu/gl/GrGLProgramDesc.cpp b/src/gpu/gl/GrGLProgramDesc.cpp
index 4a274c6bb1e8806b98043328031b18d12df8ac16..79088137caa004519ddcd91d2ad13ad000f5ab40 100644
--- a/src/gpu/gl/GrGLProgramDesc.cpp
+++ b/src/gpu/gl/GrGLProgramDesc.cpp
@@ -257,27 +257,25 @@
 
     header->fEmitsPointSize = GrGpu::kDrawPoints_DrawType == drawType;
 
-    bool isPathRendering = GrGpu::IsPathRenderingDrawType(drawType);
-    if (gpu->caps()->pathRenderingSupport() && isPathRendering) {
-        header->fUseNvpr = true;
+    if (gpu->caps()->pathRenderingSupport() &&
+        GrGpu::IsPathRenderingDrawType(drawType) &&
+        gpu->glPathRendering()->texturingMode() == GrGLPathRendering::FixedFunction_TexturingMode) {
+        header->fUseFragShaderOnly = true;
         SkASSERT(!optState.hasGeometryProcessor());
     } else {
-        header->fUseNvpr = false;
-    }
-
-    bool hasUniformColor = inputColorIsUsed &&
-                           (isPathRendering || !optState.hasColorVertexAttribute());
-
-    bool hasUniformCoverage = inputCoverageIsUsed &&
-                              (isPathRendering || !optState.hasCoverageVertexAttribute());
+        header->fUseFragShaderOnly = false;
+    }
+
+    bool defaultToUniformInputs = GrGpu::IsPathRenderingDrawType(drawType) ||
+                                  GR_GL_NO_CONSTANT_ATTRIBUTES;
 
     if (!inputColorIsUsed) {
         header->fColorInput = kAllOnes_ColorInput;
-    } else if (hasUniformColor) {
+    } else if (defaultToUniformInputs && !optState.hasColorVertexAttribute()) {
         header->fColorInput = kUniform_ColorInput;
     } else {
         header->fColorInput = kAttribute_ColorInput;
-        SkASSERT(!header->fUseNvpr);
+        SkASSERT(!header->fUseFragShaderOnly);
     }
 
     bool covIsSolidWhite = !optState.hasCoverageVertexAttribute() &&
@@ -285,11 +283,11 @@
 
     if (covIsSolidWhite || !inputCoverageIsUsed) {
         header->fCoverageInput = kAllOnes_ColorInput;
-    } else if (hasUniformCoverage) {
+    } else if (defaultToUniformInputs && !optState.hasCoverageVertexAttribute()) {
         header->fCoverageInput = kUniform_ColorInput;
     } else {
         header->fCoverageInput = kAttribute_ColorInput;
-        SkASSERT(!header->fUseNvpr);
+        SkASSERT(!header->fUseFragShaderOnly);
     }
 
     if (optState.readsDst()) {