fix for uniform view matrix being uploaded but not used

As discussed, I'll follow this up by removing localmatrix/uniform view matrix from the base classe

BUG=skia:

Review URL: https://codereview.chromium.org/920933002
diff --git a/src/gpu/effects/GrDashingEffect.cpp b/src/gpu/effects/GrDashingEffect.cpp
index a33d604..0b84c2c 100644
--- a/src/gpu/effects/GrDashingEffect.cpp
+++ b/src/gpu/effects/GrDashingEffect.cpp
@@ -645,11 +645,8 @@
     // Setup pass through color
     this->setupColorPassThrough(pb, local.fInputColorType, args.fOutputColor, NULL, &fColorUniform);
 
-    // setup uniform viewMatrix
-    this->addUniformViewMatrix(pb);
-
     // Setup position
-    SetupPosition(vsBuilder, gpArgs, dce.inPosition()->fName, dce.viewMatrix(), this->uViewM());
+    this->setupPosition(pb, gpArgs, dce.inPosition()->fName, dce.viewMatrix());
 
     // emit transforms
     this->emitTransforms(args.fPB, gpArgs->fPositionVar, dce.inPosition()->fName, dce.localMatrix(),
@@ -892,11 +889,8 @@
     // Setup pass through color
     this->setupColorPassThrough(pb, local.fInputColorType, args.fOutputColor, NULL, &fColorUniform);
 
-    // setup uniform viewMatrix
-    this->addUniformViewMatrix(pb);
-
     // Setup position
-    SetupPosition(vsBuilder, gpArgs, de.inPosition()->fName, de.viewMatrix(), this->uViewM());
+    this->setupPosition(pb, gpArgs, de.inPosition()->fName, de.viewMatrix());
 
     // emit transforms
     this->emitTransforms(args.fPB, gpArgs->fPositionVar, de.inPosition()->fName, de.localMatrix(),